Household electric appliances - Specification of the properties of a digital system for measuring the performance

IEC 63350:2026 specifies generic requirements for creating a digital system that is used for measuring the characteristics of visually detectable performance, such as browning intensity and lightness.
It defines the metrological requirements of this digital system and demonstrates the procedures for compliance. The digital system contains the measuring instrument, the software, and the reference materials necessary to realize the measurement process.
References to this document can be made by a customer when specifying the digital system and by the suppliers when specifying products offered.
Interested parties can agree to use this document as an input for satisfying measurement management system requirements in any activities.
This first edition cancels and replaces IEC TS 63350, published in 2022.
This edition includes the following significant technical changes with respect to IEC TS 63350:
a) Revision of 4.2: movable items (e.g., containers, jigs, reference objects) can now be present in the assessment area provided that mitigation measures are applied and periodic verification against known reference artefacts is documented; the requirement to keep the assessment area as constant as possible is retained.
b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included in the reference colour supporting documents from the IEC SC 59K supporting documents web site) which is referencing the conditions ISO 12647-7 and ISO 12647-2.
c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration (to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade classes.
d) Revision of 6.2: Calculation of sampling positions remains unchanged, but the procedure changes to reflect better the actual test scenario.
e) Added reporting of input image colour channel data (7.7).

Appareils électrodomestiques - Spécification des propriétés d'un système numérique pour les mesures d'aptitude à la fonction

L'IEC 63350:2026 spécifie des exigences génériques pour la création d'un système numérique utilisé pour mesurer les caractéristiques de performance détectables visuellement, comme l'intensité de brunissement et la luminosité.
Il définit les exigences métrologiques du système numérique et décrit les procédures à suivre pour assurer la conformité de ce système. Le système numérique comprend l'appareil de mesure, le logiciel et les matériaux de référence nécessaires pour conduire le processus de mesure.
Le présent document peut être référencé par le client lors de la spécification du système numérique et par les fournisseurs lors de la spécification des produits proposés.
Les parties intéressées peuvent accepter d'utiliser le présent document comme pour respecter les exigences du système de gestion de la mesure dans l'ensemble de leurs activités.
Cette première édition annule et remplace l'IEC TS 63350 parue en 2022.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'IEC TS 63350:
a) révision du 4.2: des éléments mobiles (par exemple, récipients, supports, objets de référence) peuvent désormais être présents à l'intérieur de la zone d'évaluation à condition de mettre en œuvre des mesures d'atténuation et de documenter une vérification périodique par rapport à des artefacts de référence connus; l'exigence de maintenir la zone d'évaluation aussi constante que possible est conservée;
b) ajout d'un nouveau document de support: la Note en 5.1 introduit le profil Fogra 52 (inclus dans les documents de support sur les couleurs de référence accessibles sur le site web des documents de support du SC 59K de l'IEC) qui fait référence aux conditions de l'ISO 12647-7 et de l'ISO 12647-2;
c) quatre nuances de référence supplémentaires avec des angles de teinte > 130° sont introduites en 5.3 pour l'étalonnage (afin de permettre un mesurage exact des angles de teinte au pixel près). Elles ne créent pas de nouvelles classes de nuances;
d) révision du 6.2: Le calcul des positions d'échantillonnage n'a pas changé, mais la procédure a été modifiée pour mieux refléter le scénario d'essai réel;
e) Ajout de la consignation des données de canaux chromatiques de l'image d'entrée (7.7).

General Information

Status
Published
Publication Date
27-Jan-2026
Drafting Committee
WG 4 - TC 59/SC 59K/WG 4
Current Stage
PPUB - Publication issued
Start Date
28-Jan-2026
Completion Date
27-Feb-2026

Relations

Effective Date
19-Apr-2024

Overview

IEC 63350:2026 specifies the generic requirements for the digital systems used to measure visually detectable performance characteristics, such as browning intensity and lightness, in household electric appliances. Developed by the International Electrotechnical Commission (IEC), this international standard defines the metrological requirements for digital measurement systems and details compliance procedures. The digital system covered includes the measuring instrument, its software, and essential reference materials needed for standardized measurement processes.

Manufacturers, suppliers, and consumers can reference IEC 63350:2026 when specifying, purchasing, or developing digital systems for performance evaluation of household appliances. Moreover, this standard supports compliance with broader measurement management system requirements, contributing to uniform, reproducible results.

Key Topics

  • Digital Measurement System: Defines the structure and essential elements of a system capable of objectively assessing appearance-based performance attributes of household appliances, particularly through visual metrics such as browning and lightness.
  • Metrological Requirements: Details the measurement accuracy, calibration, and verification principles the digital system must satisfy, ensuring consistent and reliable results.
  • Test Setup and Illumination: Specifies conditions for illumination, alignment with CIE standards, and the requirement for controlling variables within the assessment area to minimize measurement error.
  • Reference Materials: Introduces precise shade charts, including brown and green shade references, as calibration tools to ensure system accuracy across a range of visually critical colors.
  • Procedures for Compliance: Outlines step-by-step methodologies for verifying the evenness, lightness, and color recognition capabilities of the digital system.
  • Data Recording: Specifies the minimum raw data to be recorded-such as LAB values, hue angle, and image color channel data-for traceable performance analysis.

Applications

IEC 63350:2026 is highly relevant for:

  • Appliance Manufacturers: To standardize performance testing of ovens, toasters, and similar devices using digital systems, ensuring product consistency and market confidence.
  • Test Laboratories: As a foundation for creating or formalizing performance evaluation protocols, supporting third-party verification and certification.
  • Procurement and Quality Assurance: For suppliers and buyers seeking objective performance comparisons, IEC 63350:2026 serves as a transparent benchmark for contract requirements and product specifications.
  • Standards Compliance: Supports adherence to principles outlined in ISO 10012 for measurement management systems, making it a valuable reference for organizations seeking broader conformity and traceability.
  • Cross-Industry Use: While designed for kitchen and household appliances, this standard can inform digital system specifications for visually detectable properties in other consumer goods.

Related Standards

The development and application of IEC 63350:2026 are closely linked to several other internationally recognized standards and guidelines, promoting harmonization and best practices in measurement technology:

  • IEC TS 63350 (2022) - The previous technical specification replaced by this new international standard.
  • IEC 60350-1 and IEC 60350-2 - Standards for household electric appliances, focusing on performance measurement methodologies.
  • ISO 12647-2 & ISO 12647-7 - Graphic technology standards for process control in color proofing and offset lithographic printing, referenced for creating reference shade charts.
  • CIE 15 - International standard for colorimetry, integral to illumination and color measurement requirements.
  • ISO 15076-1 - Image technology for color management, supporting proper conversion and communication of color space information.
  • ISO 10012 - Guidelines for measurement management systems, referenced for ensuring system capability and traceability.

IEC 63350:2026 delivers a robust and practical framework for the specification, calibration, and verification of digital systems measuring the visual performance of household appliances. By adhering to its requirements, stakeholders across industries can achieve fair, reproducible, and internationally recognized measurement outcomes.

Standard

IEC 63350:2026 - Household electric appliances - Specification of the properties of a digital system for measuring the performance Released:28. 01. 2026 Isbn:9782832710142

English language
28 pages
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Standard

IEC 63350:2026 - Appareils électrodomestiques - Spécification des propriétés d'un système numérique pour les mesures d'aptitude à la fonction Released:28. 01. 2026 Isbn:9782832710142

French language
29 pages
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IEC 63350:2026 - Household electric appliances - Specification of the properties of a digital system for measuring the performance Released:28. 01. 2026 Isbn:9782832710142

English and French language
57 pages
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Frequently Asked Questions

IEC 63350:2026 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Household electric appliances - Specification of the properties of a digital system for measuring the performance". This standard covers: IEC 63350:2026 specifies generic requirements for creating a digital system that is used for measuring the characteristics of visually detectable performance, such as browning intensity and lightness. It defines the metrological requirements of this digital system and demonstrates the procedures for compliance. The digital system contains the measuring instrument, the software, and the reference materials necessary to realize the measurement process. References to this document can be made by a customer when specifying the digital system and by the suppliers when specifying products offered. Interested parties can agree to use this document as an input for satisfying measurement management system requirements in any activities. This first edition cancels and replaces IEC TS 63350, published in 2022. This edition includes the following significant technical changes with respect to IEC TS 63350: a) Revision of 4.2: movable items (e.g., containers, jigs, reference objects) can now be present in the assessment area provided that mitigation measures are applied and periodic verification against known reference artefacts is documented; the requirement to keep the assessment area as constant as possible is retained. b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included in the reference colour supporting documents from the IEC SC 59K supporting documents web site) which is referencing the conditions ISO 12647-7 and ISO 12647-2. c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration (to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade classes. d) Revision of 6.2: Calculation of sampling positions remains unchanged, but the procedure changes to reflect better the actual test scenario. e) Added reporting of input image colour channel data (7.7).

IEC 63350:2026 specifies generic requirements for creating a digital system that is used for measuring the characteristics of visually detectable performance, such as browning intensity and lightness. It defines the metrological requirements of this digital system and demonstrates the procedures for compliance. The digital system contains the measuring instrument, the software, and the reference materials necessary to realize the measurement process. References to this document can be made by a customer when specifying the digital system and by the suppliers when specifying products offered. Interested parties can agree to use this document as an input for satisfying measurement management system requirements in any activities. This first edition cancels and replaces IEC TS 63350, published in 2022. This edition includes the following significant technical changes with respect to IEC TS 63350: a) Revision of 4.2: movable items (e.g., containers, jigs, reference objects) can now be present in the assessment area provided that mitigation measures are applied and periodic verification against known reference artefacts is documented; the requirement to keep the assessment area as constant as possible is retained. b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included in the reference colour supporting documents from the IEC SC 59K supporting documents web site) which is referencing the conditions ISO 12647-7 and ISO 12647-2. c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration (to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade classes. d) Revision of 6.2: Calculation of sampling positions remains unchanged, but the procedure changes to reflect better the actual test scenario. e) Added reporting of input image colour channel data (7.7).

IEC 63350:2026 is classified under the following ICS (International Classification for Standards) categories: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances. The ICS classification helps identify the subject area and facilitates finding related standards.

IEC 63350:2026 has the following relationships with other standards: It is inter standard links to IEC TS 63350:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

IEC 63350:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


IEC 63350 ®
Edition 1.0 2026-01
INTERNATIONAL
STANDARD
Household electric appliances - Specification of the properties of a digital
system for measuring the performance

ICS 97.040.20  ISBN 978-2-8327-1014-2

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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 Terms and definitions . 6
3.2 Terms and definitions of international lighting vocabulary. 7
4 Test setup . 7
4.1 Illumination . 7
4.2 Measurement environment. 8
5 Determination of shade charts. 8
5.1 Principals of shade creation . 8
5.2 Brown shade charts . 9
5.3 Green shade charts . 10
6 Measurements. 12
6.1 Verification of evenness . 12
6.2 Lightness recognition (L* values) . 13
6.2.1 Description of the test samples . 13
6.2.2 Procedure . 13
6.2.3 Evaluation (requirements and tolerances) . 13
6.3 Colour recognition (L*, a*, b* values) . 14
6.3.1 Description of the test samples . 14
6.3.2 Procedure . 14
6.3.3 Evaluation (requirements and tolerances) . 14
6.4 Verification of the measurement area . 14
6.4.1 General. 14
6.4.2 Description of the test samples . 14
6.4.3 Procedure . 14
6.4.4 Evaluation (requirements and tolerances) . 15
6.5 Verification of the resolution . 15
6.6 Verification of rectilinear projection . 15
6.7 Verification of the 3-dimensional shapes . 15
7 Data to be recorded (raw data) . 17
7.1 Purpose . 17
7.2 LAB . 17
7.3 HLC . 17
7.4 ∆E for the test sample. 17
7.5 Dimensions (in mm) . 17
7.6 Specified measurement areas . 17
7.7 Input image colour channel data . 17
8 Consideration of tolerances . 17
8.1 General . 17
8.2 Calculation of differences in colour and its components . 17
8.3 Distance information . 18
Annex A (normative) Colour-measuring instrument . 19
Annex B (informative) Brown shade charts . 22
Annex C (informative) Green shade charts . 24
Annex D (informative) Evaluation program for determining the deviation in colour
rendering . 26
Annex E (informative) Examples of shade chart positioning for lightness recognition . 27
Bibliography . 28

Figure 1 – Cone shape of colour sample . 16
Figure 2 – 13 sections of the colour sample . 16
Figure A.1 – Colour measuring instrument di:8° . 20
Figure A.2 – Colour measuring instrument 45°:0° . 21
Figure E.1 – Example with an assessment area of 100 mm × 100 mm - 1 position per
row and column . 27
Figure E.2 – Example with an assessment area of 150 mm × 150 mm - 2 positions per
row and column . 27
Figure E.3 – Example with an assessment area of 470 mm × 370 mm - 4 positions per
row and column . 27

Table 1 – Brown shade charts with class limits . 10
Table 2 – Green shade charts . 11
Table 3 – Maximum CIELAB hue angle distance inside different ∆E* ranges . 18
ab
Table A.1 – Colour-measuring instrument specification di:8° . 19
Table A.2 – Colour-measuring instrument specification 45°:0° or 0°:45° . 20
Table B.1 – CIELAB values for the brown shade charts . 22
Table C.1 – CIELAB values for the green shade charts . 24

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household electric appliances - Specification of the properties of a digital
system for measuring the performance

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for
standardization comprising all national electrotechnical committees (IEC National Committees).
The object of IEC is to promote international co-operation on all questions concerning
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced
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held responsible for identifying any or all such patent rights.
IEC 63350 has been prepared by subcommittee SC 59K: Performance of household and similar
electrical cooking appliances, of IEC technical committee TC 59: Performance of household
and similar electrical appliances.
This first edition cancels and replaces IEC TS 63350, published in 2022.
This edition includes the following significant technical changes with respect to IEC TS 63350:
a) Revision of 4.2: Movable items (e.g., containers, jigs, reference objects) can now be present
in the assessment area provided that mitigation measures are applied and periodic
verification against known reference artefacts is documented; the requirement to keep the
assessment area as constant as possible is retained.
b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included
in the reference colour supporting documents from the IEC SC 59K supporting documents
web site) which is referencing the conditions of ISO 12647-7 and ISO 12647-2.
c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration
(to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade
classes.
d) Revision of  6.2: Calculation of sampling positions remains unchanged, but the procedure
changes to reflect better the actual test scenario.
e) Added reporting of input image colour channel data (7.7).
The text of this document is based on the following documents:
Draft Report on voting
59K/429/FDIS 59K/431/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this document is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at https://www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at https://www.iec.ch/standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
IEC subcommittee 59K has agreed to make a collection of existing and future requirements on
a digital system used in testing the performance of appliances under the scope of SC 59K,
cooking appliances.
This document bundles the generic requirements given in IEC 60350-1 and IEC 60350-2 that
are updated, aligned, and supplemented by further requirements. The reference colour system
is changed from a proprietary colour system to the standardized and widely used CIELAB-based
reference colour system.
The intention with this publication is to ensure that using a digital system, which complies with
the stated requirements and described methods, leads to reproducible results.
Currently, this document focuses on test methods described in IEC 60350-1 and IEC 60350-2
but further applications based on visually detectable performance criteria can be supplemented.
1 Scope
This document specifies generic requirements for creating a digital system that is used for
measuring the characteristics of visually detectable performance, such as browning intensity
and lightness.
It defines the metrological requirements of this digital system and demonstrates the procedures
for compliance. The digital system contains the measuring instrument, the software, and the
reference materials necessary to realize the measurement process.
References to this document can be made by a customer when specifying the digital system
and by the suppliers when specifying products offered.
Interested parties can agree to use this document as an input for satisfying measurement
management system requirements in any activities.
NOTE 1 The principles of ISO 10012 are followed to ensure the capability of the systems.
NOTE 2 Possible suppliers for the recommended digital system can be found in the supplementary file located at:
https://www.iec.ch/sc59k/supportingdocuments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO 12647-2, Graphic technology - Process control for the production of half-tone colour
separations, proof and production prints - Part 2: Offset lithographic processes
ISO 12647-7, Graphic technology - Process control for the production of half-tone colour
separations, proof and production prints - Part 7: Proofing processes working directly from
digital data
ISO 15076-1, Image technology colour management - Architecture, profile format and data
structure - Part 1: Based on ICC.1:2010
CIE 15, Colorimetry
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
digital system
system that is used for measuring the characteristics of visually detectable performance
3.1.2
assessment area
area of the digital system within which the requirements stated in this document are met and
the items under test are positioned
3.1.3
shade chart
sample representing the reference values for the colour and lightness recognition and used for
calibration of the digital system
3.1.4
items under test
IUT
objects positioned in the assessment area for evaluation
EXAMPLE 1 Shortbread, small cakes, broccoli, white bread, in accordance with IEC 60350-1.
EXAMPLE 2 Floured disc, in accordance with IEC 60350-2.
3.2 Terms and definitions of international lighting vocabulary
L* CIELAB lightness
a*, b* CIELAB a*, b* coordinates
C* CIELAB chroma
ab
h CIELAB hue angle
ab
∆L* CIELAB lightness difference
∆E* CIELAB colour difference
ab
∆E CIEDE2000 colour difference
4 Test setup
4.1 Illumination
The measurement is taken under an illumination similar to the CIE Standard Illuminate used for
the definition of the shade charts (see Clause 5).
The maximum calculated deviation of rendering the shade charts under the used light shall be
∆L* ≤ 1 for a measurement system for lightness recognition, and ∆E ≤ 5 for a measurement
system for colour recognition.
To calculate the deviation of the colour rendering, the 10° tristimulus values of the reference
colours shall be calculated with the spectral distribution of the reference colours defined in the
corresponding performance test for the relative spectral power distribution of CIE D65 and the
relative spectral power distribution of the test setup illumination. The calculation shall be
performed from 400 nm to 700 nm with a step of increment no more than 10 nm.
The spectral power distribution of the test setup illumination shall be measured along the central
axis of the beam, with the sensing surface oriented normal to this axis. The spectroradiometer
sensing surface is placed at a distance which ensures sufficient light for a measurement to be
taken while eliminating any stray light. The light shall stabilize before measurements are carried
out (e.g. stable temperature).
Spectral distribution of the reference colours for the calculation shall be acquired with a diffuse
eight-degree geometry, specular component included measurement mode (di:8°) spectrometer
in accordance with CIE 15.
NOTE 1 Necessary information on calculating the tristimulus, spectral distribution of D65, L*, a*, b* and ∆E can
be found in ISO 11664 (all parts).
An Excel evaluation program, which corresponds to the described method, is available as an
example for the automatic calculation of the deviation of the colour rendering for measured light
spectra from at least 400 nm to 700 nm with a step of increment 10 nm; see Annex D. This
document includes the light spectra of the proposed reference colours of this document and the
light spectra of the CRI calculation colours in accordance with CIE 15.
NOTE 2 The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments
4.2 Measurement environment
During measurements, movable items other than the IUT, such as containers, reference objects,
jigs, and other similar items, can be present near or inside the assessment area, provided that
measures are implemented to mitigate their effect on the object under test and ensure that the
measurement results remain within the specified tolerances.
EXAMPLE For example by placing known reference objects (e.g. shade charts) within the assessment area, in the
presence of these non-IUT items, and performing measurements using the same setup. The measured values of
these reference objects are compared to their known values to confirm that the deviation remains within the specified
tolerances. This verification is documented and repeated at intervals to ensure ongoing compliance with the tolerance
requirements.
The assessment area shall be kept as constant as possible since every item can alter the
illumination by absorption or reflection.
5 Determination of shade charts
5.1 Principals of shade creation
Shade charts represent the reference values for the colour and lightness recognition. Since the
recognition is based on classes, the shade chart shall represent the centre point of each class.
For recognition based on 1-dimensional classes (e.g. L*), the values of the defined reference
colour shall be in the centre of the boundaries of each class. This is achieved by mathematically
creating the reference colours along a line in the 3-dimensional CIELAB colour space.
For recognition based on multiple dimensions within the CIELAB colour space, the defined
reference colours shall be located with equal distances within a space defined by at least 3
coordinates. The equal distancing between the defined colours shall be based on at least two
values of the CIELAB system (ISO/CIE 11664-4). This results in a colour gradient with a linear
step size in at least 2 dimensions.
Defined colours shall be printed in accordance with the proof process described in ISO 12647-
7 on matt proofing paper simulating PS5 (print substrate 5 in accordance with ISO 12647-2) as
spot colours. The printed colour samples shall be calibrated with a diffuse eight-degree
geometry, specular component included measurement mode (di:8°) spectrometer in accordance
with CIE 15 and shall be in a range of ∆L* ≤ 1,5 if used as reference colours for the lightness
recognition and ∆E ≤ 5 if used as reference colours for the colour recognition.
___________
Excel is the trade name of a product supplied by Microsoft Corporation. This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of the product named.
Equivalent products may be used if they can be shown to lead to the same results.
Proof process defined in ISO 12647-7 is referring to spectral measurement defined in ISO 13655
which is (45°:0°) or (0°:45°) geometry and D50 reference illumination. Requirements for colour
measuring instruments in accordance with CIE 15 for (di:8°) and (45°:0°) or (0°:45°) geometry
are stated in Annex A. For proper colour communication, conversion of the colour information
to a reference colour space described in ISO 15076-1 is necessary. Converted values and the
applied conversion models for the exemplary shade charts shown in this document can be found
in Annex B and Annex C.
Created shade charts shall be within the limits of the sRGB colour space.
NOTE 1 Necessary information on transforming the CIEXYZ colour space to sRGB can be found in IEC 61966-2-1
and transforming the CIELAB colour space to the CIEXYZ colour space can be found in ISO/CIE 11664-4.
NOTE 2 Provided shade documents in the supporting documents contain the Fogra 52 profile,
https://www.iec.ch/sc59k/supportingdocuments. This profile includes the required conditions outlined in ISO 12647-
7 and ISO 12647-2.
NOTE 3 For visual assessment of defined colours, the contract proof requirements of ISO 12647-7 for spot colours
are sufficient to indicate colour accuracy, where spot colours are allowed a maximum deviation of 2,5 ΔE 0:45°
respectively 45:0° M1, which is close to the just noticeable difference for human vision, ensuring reliable colour
representation.
5.2 Brown shade charts
Brown shade charts are used to verify the lightness recognition of the digital measurement
system. The relevant value for the brown shade charts is L*.
The ∆L* of each defined colour step shall be equal. To achieve a linear colour gradient between
L*
� �
the defined colours, the a* coordinates shall lie on a line that connects at least 2 (maximum
b*
4) reference colours within the 3-dimensional CIELAB colour space. This results in a uniform
Euclidean distance (∆E* ) of the points that lie on the same line.
ab
As an example, the calculated values of 14 reference colours located on 2 lines based on 3 L*,
a* and b* coordinates are shown in Table 1.
60,7 88,9
L* 27,8
In the example, the 3 defined � � coordinates are � 6,4�, �16,4�, � 2,9�.
a*
4,4 33,0 27,0
b*
Table 1 – Brown shade charts with class limits
Shade L* a* b* ∆L* Lower L* limit for Upper L* limit for ∆E* R G B
ab
No. shade class shade class
17 27,8 6,4 4,4 0 30,15 78 62 59

16 32,5 7,9 8,5 4,7 30,15 34,85 6,4 93 72 63
15 37,2 9,3 12,6 4,7 34,85 39,55 6,4 109 82 67
14 41,9 10,7 16,7 4,7 39,55 44,25 6,4 125 92 71
13 46,6 12,1 20,8 4,7 44,25 48,95 6,4 141 102 76
12 51,3 13,6 24,8 4,7 48,95 53,65 6,4 157 113 80
11 56,0 15,0 28,9 4,7 53,65 58,35 6,4 174 124 84
10 60,7 16,4 33,0 4,7 58,35 63,05 6,4 190 135 88
9 65,4 14,1 32,0 4,7 63,05 67,75 5,3 200 148 101
8 70,1 11,9 31,0 4,7 67,75 72,45 5,3 210 162 115
7 74,8 9,6 30,0 4,7 72,45 77,15 5,3 219 177 128
6 79,5 7,4 29,0 4,7 77,15 81,85 5,3 229 191 142
5 84,2 5,1 28,0 4,7 81,85 86,55 5,3 238 205 156
4 88,9 2,9 27,0 4,7 86,55 100,00 5,3 248 220 171
The proof process defined in ISO 12647-7 is referring to the spectral measu
...


IEC 63350 ®
Edition 1.0 2026-01
NORME
INTERNATIONALE
Appareils électrodomestiques - Spécification des propriétés d'un système
numérique pour les mesures d'aptitude à la fonction

ICS 97.040.20  ISBN 978-2-8327-1014-2

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SOMMAIRE
AVANT-PROPOS . 3
INTRODUCTION . 5
1 Domaine d'application . 6
2 Références normatives . 6
3 Termes et définitions. 6
3.1 Termes et définitions. 6
3.2 Termes et définitions issus du vocabulaire international de l'éclairage. 7
4 Montage d'essai . 7
4.1 Éclairage . 7
4.2 Environnement de mesure . 8
5 Détermination des nuanciers . 8
5.1 Principes de la création de nuances . 8
5.2 Nuanciers de teintes brunes . 9
5.3 Nuanciers de teintes vertes . 10
6 Mesurages . 12
6.1 Vérification de l'uniformité . 12
6.2 Reconnaissance de la luminosité (valeurs L*) . 13
6.2.1 Description des échantillons d'essai . 13
6.2.2 Mode opératoire. 13
6.2.3 Évaluation (exigences et tolérances) . 14
6.3 Reconnaissance des couleurs (valeurs L*, a* et b*) . 14
6.3.1 Description des échantillons d'essai . 14
6.3.2 Mode opératoire. 14
6.3.3 Évaluation (exigences et tolérances) . 14
6.4 Vérification de la zone de mesure . 15
6.4.1 Généralités . 15
6.4.2 Description des échantillons d'essai . 15
6.4.3 Mode opératoire. 15
6.4.4 Évaluation (exigences et tolérances) . 15
6.5 Vérification de la résolution . 15
6.6 Vérification de la projection rectiligne . 15
6.7 Vérification des formes tridimensionnelles . 16
7 Données à enregistrer (données brutes) . 17
7.1 Objet . 17
7.2 Coordonnées LAB . 17
7.3 Coordonnées HLC . 17
7.4 Valeur ∆E pour l'échantillon d'essai . 17
7.5 Dimensions (en mm) . 17
7.6 Zones de mesure spécifiées . 18
7.7 Données de canaux chromatiques de l'image d'entrée . 18
8 Prise en compte des tolérances . 18
8.1 Généralités . 18
8.2 Calcul des différences de couleur et de ses composantes . 18
8.3 Informations sur les distances . 19
Annexe A (normative) Colorimètre . 20
Annexe B (informative) Nuanciers de teintes brunes . 23
Annexe C (informative) Nuanciers de teintes vertes . 25
Annexe D (informative) Programme d'évaluation pour déterminer l'écart de rendu des
couleurs . 27
Annexe E (informative) Exemples de positions des nuanciers (3.1.3) pour la
reconnaissance de la luminosité . 28
Bibliographie . 29

Figure 1 – Échantillon de couleur de forme conique . 16
Figure 2 – 13 sections de l'échantillon de couleur . 17
Figure A.1 – Colorimètre di:8° . 21
Figure A.2 – Colorimètre 45°:0° . 22
Figure E.1 – Exemple avec une zone d'évaluation (3.1.2) de 100 mm × 100 mm –
1 position par ligne et par colonne . 28
Figure E.2 – Exemple avec une zone d'évaluation (3.1.2) de 150 mm × 150 mm –
2 positions par ligne et par colonne . 28
Figure E.3 – Exemple avec une zone d'évaluation (3.1.2) de 470 mm × 370 mm –
4 positions par ligne et par colonne . 28

Tableau 1 – Nuanciers de teintes brunes avec limites de classes . 10
Tableau 2 – Nuanciers de teintes vertes . 11
Tableau 3 – Distances maximales de l'angle de teinte CIELAB pour différentes plages
de ∆E* . 19
ab
Tableau A.1 – Spécifications des colorimètres di:8° . 20
Tableau A.2 – Spécifications des colorimètres 45°:0° ou 0°:45°. 21
Tableau B.1 – Valeurs CIELAB pour les nuanciers de teintes brunes . 23
Tableau C.1 – Valeurs CIELAB pour les nuanciers de teintes vertes . 25

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Appareils électrodomestiques - Spécification des propriétés d'un système
numérique pour les mesurages d'aptitude à la fonction

AVANT-PROPOS
1) La Commission Électrotechnique Internationale (IEC) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
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ou au crédit qui lui est accordé.
8) L'attention est attirée sur les références normatives citées dans cette publication. L'utilisation de publications
référencées est obligatoire pour une application correcte de la présente publication.
9) L'IEC attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation d'un
ou de plusieurs brevets. L'IEC ne prend pas position quant à la preuve, à la validité et à l'applicabilité de tout
droit de brevet revendiqué à cet égard. À la date de publication du présent document, l'IEC n'avait pas reçu
notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois, il y a lieu
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L'IEC ne saurait être tenue pour responsable de ne pas avoir identifié de tels droits de brevets.
L'IEC 63350 a été établie par le sous-comité 59K: Aptitude à la fonction des appareils
électrodomestiques et similaires de cuisson électrique, du comité d'études 59 de l'IEC: Aptitude
à la fonction des appareils électrodomestiques.
Cette première édition annule et remplace l'IEC TS 63350 parue en 2022.
Cette édition inclut les modifications techniques majeures suivantes par rapport à
l'IEC TS 63350:
a) révision du 4.2: des éléments mobiles (par exemple, récipients, supports, objets de
référence) peuvent désormais être présents à l'intérieur de la zone d'évaluation à condition
de mettre en œuvre des mesures d'atténuation et de documenter une vérification périodique
par rapport à des artefacts de référence connus; l'exigence de maintenir la zone d'évaluation
aussi constante que possible est conservée;
b) ajout d'un nouveau document de support: la Note en 5.1 introduit le profil Fogra 52 (inclus
dans les documents de support sur les couleurs de référence accessibles sur le site web
des documents de support du SC 59K de l'IEC) qui fait référence aux conditions de
l'ISO 12647-7 et de l'ISO 12647-2;
c) quatre nuances de référence supplémentaires avec des angles de teinte > 130° sont
introduites en 5.3 pour l'étalonnage (afin de permettre un mesurage exact des angles de
teinte au pixel près). Elles ne créent pas de nouvelles classes de nuances;
d) révision du 6.2: Le calcul des positions d'échantillonnage n'a pas changé, mais la procédure
a été modifiée pour mieux refléter le scénario d'essai réel;
e) Ajout de la consignation des données de canaux chromatiques de l'image d'entrée (7.7).
Le texte de ce document est issu des documents suivants:
Projet Rapport de vote
59K/402/CDV 59K/XXX/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de ce document est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
https://www.iec.ch/members_experts/refdocs. Les principaux types de documents développés
par l'IEC sont décrits plus en détail sous https://www.iec.ch/standardsdev/publications.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
INTRODUCTION
Le sous-comité 59K de l'IEC a accepté d'élaborer un ensemble d'exigences actuelles et futures
concernant un système numérique destiné aux essais d'aptitude à la fonction des appareils de
cuisson relevant du SC 59K.
Le présent document regroupe les exigences génériques définies dans l'IEC 60350-1 et
l'IEC 60350-2 qui ont été mises à jour, alignées sur et complétées par d'autres exigences. Pour
le système colorimétrique de référence, le système colorimétrique propriétaire a été remplacé
par le système colorimétrique de référence CIELAB normalisé et couramment utilisé.
L'objectif de la présente publication est de s'assurer que l'utilisation d'un système
numérique conforme aux exigences définies et aux méthodes décrites permet d'obtenir des
résultats reproductibles.
À ce jour, le présent document couvre les méthodes d'essai décrites dans l'IEC 60350-1 et
l'IEC 60350-2, mais d'autres applications fondées sur des critères de performance détectables
visuellement pourraient être ajoutées ultérieurement.
1 Domaine d'application
Le présent document spécifie des exigences génériques pour la création d'un système
numérique utilisé pour mesurer les caractéristiques de performance détectables visuellement,
comme l'intensité de brunissement et la luminosité.
Il définit les exigences métrologiques du système numérique et décrit les procédures à suivre
pour assurer la conformité de ce système. Le système numérique comprend l'appareil de
mesure, le logiciel et les matériaux de référence nécessaires pour conduire le processus de
mesure.
Le présent document peut être référencé par le client lors de la spécification du système
numérique et par les fournisseurs lors de la spécification des produits proposés.
Les parties intéressées peuvent accepter d'utiliser le présent document comme pour respecter
les exigences du système de gestion de la mesure dans l'ensemble de leurs activités.
NOTE 1 Les principes de l'ISO 10012 sont mis en application pour assurer la capacité des systèmes.
NOTE 2 Les fournisseurs possibles du système numérique recommandé peuvent être consultés dans le fichier
supplémentaire accessible à l'adresse: https://www.iec.ch/sc59k/supportingdocuments.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l'édition citée s'applique. Pour les références non datées, la dernière édition du document de
référence s'applique (y compris les éventuels amendements).
ISO 12647-2, Technologie graphique – Maîtrise des procédés pour la fabrication des
séparations de couleur en ton tramé, des épreuves et des tirages en production – Partie 2:
Procédés lithographiques offset
ISO 12647-7, Graphic technology – Process control for the production of half-tone colour
separations, proof and production prints – Part 7: Proofing processes working directly from
digital data (disponible en anglais seulement)
ISO 15076-1, Image technology colour management – Architecture, profile format and data
structure – Part 1: Based on ICC.1:2010 (disponible en anglais seulement)
CIE 15, Colorimétrie
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions suivants s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
– IEC Electropedia: disponible à l'adresse https://www.electropedia.org/
– ISO Online browsing platform: disponible à l'adresse https://www.iso.org/obp
3.1 Termes et définitions
3.1.1
système numérique
système utilisé pour mesurer les caractéristiques de performance détectables visuellement
3.1.2
zone d'évaluation
zone du système numérique dans laquelle les exigences du présent document doivent être
respectées et les éléments en cours d'essai sont placés
3.1.3
nuancier
échantillon qui représente les valeurs de référence pour la reconnaissance des couleurs et de
la luminosité et qui est utilisé pour l'étalonnage du système numérique
3.1.4
éléments en cours d'essai
IUT
objets placés à l'intérieur de la zone d'évaluation pour les besoins de l'évaluation
Note 1 à l'article: L'abréviation "IUT" est dérivée du terme anglais développé correspondant "items under test".
EXEMPLE 1 Sablés, petits gâteaux, brocoli, pain blanc conformément à l'IEC 60350-1.
EXEMPLE 2 Disque fariné conformément à l'IEC 60350-2.
3.2 Termes et définitions issus du vocabulaire international de l'éclairage
luminosité CIELAB
L*
a*, b* coordonnées CIELAB a*, b*
chroma CIELAB
C*
ab
h angle de teinte CIELAB
ab
différence de luminosité CIELAB
∆L*
∆E* différence de couleur CIELAB
ab
différence de couleur CIEDE2000
∆E
4 Montage d'essai
4.1 Éclairage
Le mesurage est effectué sous un éclairage analogue à l'illuminant CIE normalisé utilisé pour
définir les nuanciers (voir l'Article 5).
L'écart de rendu maximal calculé pour les nuanciers sous l'éclairage utilisé doit être ∆L* ≤ 1
dans le cas d'un système de mesure pour la reconnaissance de la luminosité et ∆E ≤ 5 dans
le cas d'un système de mesure pour la reconnaissance des couleurs.
Pour calculer l'écart de rendu des couleurs, les composantes trichromatiques à 10° des
couleurs de référence doivent être calculées avec la distribution spectrale des couleurs de
référence définie dans l'essai de performance correspondant pour la distribution spectrale
relative d'énergie du CIE D65 et la distribution spectrale relative d'énergie de l'éclairage du
montage d'essai. Le calcul doit être effectué dans le domaine des longueurs d'onde de 400 nm
à 700 nm, à intervalles de 10 nm au maximum.
La distribution spectrale d'énergie de l'éclairage du montage d'essai est mesurée sur l'axe
central du faisceau, en plaçant la surface sensible perpendiculairement à cette direction. La
surface sensible du spectroradiomètre est placée à une distance qui procure un éclairage
suffisant et permet d'effectuer un mesurage en éliminant toute lumière parasite. La lumière doit
se stabiliser avant de procéder aux mesurages (par exemple, température stable).
La distribution spectrale des couleurs de référence utilisée pour le calcul doit être obtenue en
utilisant un spectromètre en mode de mesure avec composante spéculaire incluse et avec une
géométrie de mesure diffuse à huit degrés (di:8°) conformément à la CIE 15.
NOTE 1 Les informations nécessaires au calcul des composantes trichromatiques, de la distribution spectrale du
D65, des valeurs L*, a*, b* et ∆E peuvent être consultées dans la série ISO 11664 (toutes les parties).
Un exemple de programme d'évaluation Excel est fourni pour la méthode décrite dans le cadre
du calcul automatique de l'écart de rendu des couleurs pour les spectres lumineux mesurés
dans le domaine des longueurs d'onde de 400 nm au moins à 700 nm, à intervalles de 10 nm
(voir l'Annexe D). Le présent document couvre les spectres lumineux des couleurs de référence
proposées dans le présent document, ainsi que les spectres lumineux des couleurs du calcul
CRI conformément à la CIE 15.
NOTE 2 Le fichier supplémentaire pour la méthode décrite est accessible à l'adresse:
https://www.iec.ch/sc59k/supportingdocuments.
4.2 Environnement de mesure
Pendant les mesurages, des éléments mobiles autres que les IUT, tels que des récipients,
objets de référence, supports et autres éléments analogues, peuvent être présents à proximité
ou à l'intérieur de la zone d'évaluation, à condition de mettre en œuvre des mesures pour
atténuer leur effet sur l'objet en essai et de s'assurer que les résultats de mesure restent dans
les tolérances spécifiées.
EXEMPLE Placement d'objets de référence connus (par exemple, nuanciers) à l'intérieur de la zone d'évaluation,
en présence de ces éléments non IUT, et réalisation des mesurages avec le même montage. Les valeurs mesurées
pour ces objets de référence sont ensuite comparées à leurs valeurs connues afin de confirmer que l'écart reste
dans les tolérances spécifiées. Cette vérification est documentée et répétée périodiquement pour assurer la
conformité continue aux exigences de tolérance définies.
La zone d'évaluation doit être maintenue aussi constante que possible, car chaque élément
peut modifier l'éclairage par absorption ou par réflexion.
5 Détermination des nuanciers
5.1 Principes de la création de nuances
Les nuanciers représentent les valeurs de référence utilisées pour la reconnaissance des
couleurs et de la luminosité. Étant donné que la reconnaissance est fondée sur des classes, le
nuancier doit représenter le point central de chaque classe.
Pour la reconnaissance fondée sur des classes unidimensionnelles (par exemple, L*), les
valeurs de la couleur de référence définie doivent être situées au centre des frontières de
chaque classe. Pour ce faire, les couleurs de référence sont créées de manière mathématique
le long d'une ligne dans l'espace chromatique CIELAB tridimensionnel.
Pour la reconnaissance fondée sur plusieurs dimensions dans l'espace chromatique CIELAB,
les couleurs de référence définies doivent être situées à équidistance dans un espace défini
par au moins 3 coordonnées. L'équidistance entre les couleurs définies doit être déterminée en
s'appuyant sur au moins deux valeurs du système CIELAB (ISO/CIE 11664-4). Cela permet
d'obtenir un gradient de couleur avec une taille d'échelon linéaire dans au moins 2 dimensions.

___________
Excel est l'appellation commerciale d'un produit distribué par Microsoft Corporation. Cette information est donnée
à l'intention des utilisateurs du présent document et ne signifie nullement que l'IEC approuve l'emploi du produit
ainsi désigné. Des produits équivalents peuvent être utilisés s'il est démontré qu'ils aboutissent aux mêmes
résultats.
Les couleurs définies doivent être imprimées conformément au processus d'épreuve décrit dans
l'ISO 12647-7 sur du papier d'épreuve mat simulant du papier PS5 (support d'impression 5
selon l'ISO 12647-2) en tant que couleurs d'accompagnement. Les échantillons de couleur
imprimés doivent être étalonnés en utilisant un spectromètre en mode de mesure avec
composante spéculaire incluse et avec une géométrie de mesure diffuse à huit degrés (di:8°)
conformément à la CIE 15 et doivent être compris dans une plage de ∆L* ≤ 1,5 s'ils sont utilisés
comme couleurs de référence pour la reconnaissance de la luminosité et de ∆E ≤ 5 s'ils sont
utilisés comme couleurs de référence pour la reconnaissance des couleurs.
Le processus d'épreuve défini dans l'ISO 12647-7 fait référence au mesurage spectral défini
dans l'ISO 13655 qui utilise une géométrie de mesure (45°:0°) ou (0°:45°) et l'illuminant de
référence D50. Les exigences applicables aux colorimètres conformes à la CIE 15 pour les
géométries de mesure (di:8°) et (45°:0°) ou (0°:45°) sont fournies à l'Annexe A. Pour une
communication correcte des couleurs, il est nécessaire de convertir les informations
colorimétriques dans un espace chromatique de référence, comme cela est décrit dans
l'ISO 15076-1. Les valeurs converties et les modèles de conversion appliqués pour les
exemples de nuanciers fournis dans le présent document peuvent être consultés à l'Annexe B
et à l'Annexe C.
Les nuanciers créés doivent se situer dans les limites de l'espace chromatique sRVB.
NOTE 1 Les informations nécessaires à la conversion de l'espace chromatique CIEXYZ en sRVB peuvent être
consultées dans l'IEC 61966-2-1. Les informations nécessaires à la conversion de l'espace chromatique CIELAB en
espace chromatique CIEXYZ peuvent être consultées dans l'ISO/CIE 11664-4.
NOTE 2 Les documents de nuance fournis dans les documents de support contiennent le profil Fogra 52,
https://www.iec.ch/sc59k/supportingdocuments. Ce profil inclut les conditions exigées décrites dans l'ISO 12647-7
et l'ISO 12647-2.
NOTE 3 Pour l'évaluation visuelle des couleurs définies, les exigences d'épreuves contractuelles de l'ISO 12647-7
pour les couleurs d'accompagnement sont suffisantes pour indiquer l'exactitude des couleurs, tandis que les couleurs
d'accompagnement sont tolérées avec un écart maximal de 2,5 ∆E 0:45° soit 45:0° M1, ce qui est proche de la
différence juste perceptible pour la vision humaine, assurant ainsi une représentation fiable des couleurs.
5.2 Nuanciers de teintes brunes
Les nuanciers de teintes brunes sont utilisés pour vérifier la reconnaissance de la luminosité
du système de mesure numérique. La valeur pertinente pour les nuanciers de teintes brunes
est L*.
La valeur ∆L* doit être identique pour chaque échelon de couleur défini. Pour obtenir un
L*
 
 
gradient de couleur linéaire entre les couleurs définies, les coordonnées a* doivent être
 
 
b*
 
situées sur une ligne qui relie au moins 2 couleurs de référence (4 au maximum) dans l'espace
chromatique CIELAB tridimensionnel. Cela permet d'obtenir une distance euclidienne uniforme
(∆E* ) des points situés sur la même ligne.
ab
À titre d'exemple, le Tableau 1 donne les valeurs calculées pour 14 couleurs de référence
situées sur 2 lignes, avec 3 coordonnées L*, a* et b*.
L* 27,8 60,7 88,9
      
Dans l'exemple, les 3 coordonnées a* définies sont 6,4 , 16,4 et 2,9 .
      
      
b* 4,4 33,0 27,0
      
Tableau 1 – Nuanciers de teintes brunes avec limites de classes
N° de
L* a* b* ∆L* Limite L* Limite L* ∆E* R V B
ab
nuance
inférieure pour la supérieure pour la
classe de nuance classe de nuance
17 27,8 6,4 4,4 0 30,15 78 62 59

16 32,5 7,9 8,5 4,7 30,15 34,85 6,4 93 72 63
15 37,2 9,3 12,6 4,7 34,85 39,55 6,4 109 82 67
14 41,9 10,7 16,7 4,7 39,55 44,25 6,4 125 92 71
13 46,6 12,1 20,8 4,7 44,25 48,95 6,4 141 102 76
12 51,3 13,6 24,8 4,7 48,95 53,65 6,4 157 113 80
11 56,0 15,0 28,9 4,7 53,65 58,35 6,4 174 124 84
10 60,7 16,4 33,0 4,7 58,35 63,05 6,4 190 135 88
9 65,4 14,1 32,0 4,7 63,05 67,75 5,3 200 148 101
8 70,1 11,9 31,0 4,7 67,75 72,45 5,3 210 162 115
7 74,8 9,6 30,0 4,7 72,45 77,15 5,3 219 177 128
6 79,5 7,4 29,0 4,7 77,15 81,85 5,3 229 191 142
5 84,2 5,1 28,0 4,7 81,85 86,55 5,3 238 205 156
4 88,9 2,9 27,0 4,7 86,55 100,00 5,3 248 220 171

Le processus d'épreuve défini dans l'ISO 12647-7 fait référence au mesurage spectral défini
dans l'ISO 13655 qui utilise une géométrie de mesure (45°:0°) ou (0°:45°
...


IEC 63350 ®
Edition 1.0 2026-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household electric appliances - Specification of the properties of a digital
system for measuring the performance

Appareils électrodomestiques - Spécification des propriétés d'un système
numérique pour les mesures d'aptitude à la fonction

ICS 97.040.20  ISBN 978-2-8327-1014-2

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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 Terms and definitions . 6
3.2 Terms and definitions of international lighting vocabulary. 7
4 Test setup . 7
4.1 Illumination . 7
4.2 Measurement environment. 8
5 Determination of shade charts. 8
5.1 Principals of shade creation . 8
5.2 Brown shade charts . 9
5.3 Green shade charts . 10
6 Measurements. 12
6.1 Verification of evenness . 12
6.2 Lightness recognition (L* values) . 13
6.2.1 Description of the test samples . 13
6.2.2 Procedure . 13
6.2.3 Evaluation (requirements and tolerances) . 13
6.3 Colour recognition (L*, a*, b* values) . 14
6.3.1 Description of the test samples . 14
6.3.2 Procedure . 14
6.3.3 Evaluation (requirements and tolerances) . 14
6.4 Verification of the measurement area . 14
6.4.1 General. 14
6.4.2 Description of the test samples . 14
6.4.3 Procedure . 14
6.4.4 Evaluation (requirements and tolerances) . 15
6.5 Verification of the resolution . 15
6.6 Verification of rectilinear projection . 15
6.7 Verification of the 3-dimensional shapes . 15
7 Data to be recorded (raw data) . 17
7.1 Purpose . 17
7.2 LAB . 17
7.3 HLC . 17
7.4 ∆E for the test sample. 17
7.5 Dimensions (in mm) . 17
7.6 Specified measurement areas . 17
7.7 Input image colour channel data . 17
8 Consideration of tolerances . 17
8.1 General . 17
8.2 Calculation of differences in colour and its components . 17
8.3 Distance information . 18
Annex A (normative) Colour-measuring instrument . 19
Annex B (informative) Brown shade charts . 22
Annex C (informative) Green shade charts . 24
Annex D (informative) Evaluation program for determining the deviation in colour
rendering . 26
Annex E (informative) Examples of shade chart positioning for lightness recognition . 27
Bibliography . 28

Figure 1 – Cone shape of colour sample . 16
Figure 2 – 13 sections of the colour sample . 16
Figure A.1 – Colour measuring instrument di:8° . 20
Figure A.2 – Colour measuring instrument 45°:0° . 21
Figure E.1 – Example with an assessment area of 100 mm × 100 mm - 1 position per
row and column . 27
Figure E.2 – Example with an assessment area of 150 mm × 150 mm - 2 positions per
row and column . 27
Figure E.3 – Example with an assessment area of 470 mm × 370 mm - 4 positions per
row and column . 27

Table 1 – Brown shade charts with class limits . 10
Table 2 – Green shade charts . 11
Table 3 – Maximum CIELAB hue angle distance inside different ∆E* ranges . 18
ab
Table A.1 – Colour-measuring instrument specification di:8° . 19
Table A.2 – Colour-measuring instrument specification 45°:0° or 0°:45° . 20
Table B.1 – CIELAB values for the brown shade charts . 22
Table C.1 – CIELAB values for the green shade charts . 24

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household electric appliances - Specification of the properties of a digital
system for measuring the performance

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for
standardization comprising all national electrotechnical committees (IEC National Committees).
The object of IEC is to promote international co-operation on all questions concerning
standardization in the electrical and electronic fields. To this end and in addition to other
activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
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Publication(s)"). Their preparation is entrusted to technical committees; any IEC National
Committee interested in the subject dealt with may participate in this preparatory work.
International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as
possible, an international consensus of opinion on the relevant subjects since each technical
committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted
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of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced
publications is indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC had not received notice of (a) patent(s), which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which
may be obtained from the patent database available at https://patents.iec.ch. IEC shall not be
held responsible for identifying any or all such patent rights.
IEC 63350 has been prepared by subcommittee SC 59K: Performance of household and similar
electrical cooking appliances, of IEC technical committee TC 59: Performance of household
and similar electrical appliances.
This first edition cancels and replaces IEC TS 63350, published in 2022.
This edition includes the following significant technical changes with respect to IEC TS 63350:
a) Revision of 4.2: Movable items (e.g., containers, jigs, reference objects) can now be present
in the assessment area provided that mitigation measures are applied and periodic
verification against known reference artefacts is documented; the requirement to keep the
assessment area as constant as possible is retained.
b) Addition of new supporting document: Note in 5.1 introduces the Fogra 52 profile (included
in the reference colour supporting documents from the IEC SC 59K supporting documents
web site) which is referencing the conditions of ISO 12647-7 and ISO 12647-2.
c) Four additional reference shades with hue angles > 130° are introduced in 5.3 for calibration
(to enable accurate pixel‑wise hue‑angle measurement). These do not create new shade
classes.
d) Revision of  6.2: Calculation of sampling positions remains unchanged, but the procedure
changes to reflect better the actual test scenario.
e) Added reporting of input image colour channel data (7.7).
The text of this document is based on the following documents:
Draft Report on voting
59K/429/FDIS 59K/431/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this document is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at https://www.iec.ch/members_experts/refdocs. The main document types developed by IEC
are described in greater detail at https://www.iec.ch/standardsdev/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
IEC subcommittee 59K has agreed to make a collection of existing and future requirements on
a digital system used in testing the performance of appliances under the scope of SC 59K,
cooking appliances.
This document bundles the generic requirements given in IEC 60350-1 and IEC 60350-2 that
are updated, aligned, and supplemented by further requirements. The reference colour system
is changed from a proprietary colour system to the standardized and widely used CIELAB-based
reference colour system.
The intention with this publication is to ensure that using a digital system, which complies with
the stated requirements and described methods, leads to reproducible results.
Currently, this document focuses on test methods described in IEC 60350-1 and IEC 60350-2
but further applications based on visually detectable performance criteria can be supplemented.
1 Scope
This document specifies generic requirements for creating a digital system that is used for
measuring the characteristics of visually detectable performance, such as browning intensity
and lightness.
It defines the metrological requirements of this digital system and demonstrates the procedures
for compliance. The digital system contains the measuring instrument, the software, and the
reference materials necessary to realize the measurement process.
References to this document can be made by a customer when specifying the digital system
and by the suppliers when specifying products offered.
Interested parties can agree to use this document as an input for satisfying measurement
management system requirements in any activities.
NOTE 1 The principles of ISO 10012 are followed to ensure the capability of the systems.
NOTE 2 Possible suppliers for the recommended digital system can be found in the supplementary file located at:
https://www.iec.ch/sc59k/supportingdocuments.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO 12647-2, Graphic technology - Process control for the production of half-tone colour
separations, proof and production prints - Part 2: Offset lithographic processes
ISO 12647-7, Graphic technology - Process control for the production of half-tone colour
separations, proof and production prints - Part 7: Proofing processes working directly from
digital data
ISO 15076-1, Image technology colour management - Architecture, profile format and data
structure - Part 1: Based on ICC.1:2010
CIE 15, Colorimetry
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Terms and definitions
3.1.1
digital system
system that is used for measuring the characteristics of visually detectable performance
3.1.2
assessment area
area of the digital system within which the requirements stated in this document are met and
the items under test are positioned
3.1.3
shade chart
sample representing the reference values for the colour and lightness recognition and used for
calibration of the digital system
3.1.4
items under test
IUT
objects positioned in the assessment area for evaluation
EXAMPLE 1 Shortbread, small cakes, broccoli, white bread, in accordance with IEC 60350-1.
EXAMPLE 2 Floured disc, in accordance with IEC 60350-2.
3.2 Terms and definitions of international lighting vocabulary
L* CIELAB lightness
a*, b* CIELAB a*, b* coordinates
C* CIELAB chroma
ab
h CIELAB hue angle
ab
∆L* CIELAB lightness difference
∆E* CIELAB colour difference
ab
∆E CIEDE2000 colour difference
4 Test setup
4.1 Illumination
The measurement is taken under an illumination similar to the CIE Standard Illuminate used for
the definition of the shade charts (see Clause 5).
The maximum calculated deviation of rendering the shade charts under the used light shall be
∆L* ≤ 1 for a measurement system for lightness recognition, and ∆E ≤ 5 for a measurement
system for colour recognition.
To calculate the deviation of the colour rendering, the 10° tristimulus values of the reference
colours shall be calculated with the spectral distribution of the reference colours defined in the
corresponding performance test for the relative spectral power distribution of CIE D65 and the
relative spectral power distribution of the test setup illumination. The calculation shall be
performed from 400 nm to 700 nm with a step of increment no more than 10 nm.
The spectral power distribution of the test setup illumination shall be measured along the central
axis of the beam, with the sensing surface oriented normal to this axis. The spectroradiometer
sensing surface is placed at a distance which ensures sufficient light for a measurement to be
taken while eliminating any stray light. The light shall stabilize before measurements are carried
out (e.g. stable temperature).
Spectral distribution of the reference colours for the calculation shall be acquired with a diffuse
eight-degree geometry, specular component included measurement mode (di:8°) spectrometer
in accordance with CIE 15.
NOTE 1 Necessary information on calculating the tristimulus, spectral distribution of D65, L*, a*, b* and ∆E can
be found in ISO 11664 (all parts).
An Excel evaluation program, which corresponds to the described method, is available as an
example for the automatic calculation of the deviation of the colour rendering for measured light
spectra from at least 400 nm to 700 nm with a step of increment 10 nm; see Annex D. This
document includes the light spectra of the proposed reference colours of this document and the
light spectra of the CRI calculation colours in accordance with CIE 15.
NOTE 2 The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments
4.2 Measurement environment
During measurements, movable items other than the IUT, such as containers, reference objects,
jigs, and other similar items, can be present near or inside the assessment area, provided that
measures are implemented to mitigate their effect on the object under test and ensure that the
measurement results remain within the specified tolerances.
EXAMPLE For example by placing known reference objects (e.g. shade charts) within the assessment area, in the
presence of these non-IUT items, and performing measurements using the same setup. The measured values of
these reference objects are compared to their known values to confirm that the deviation remains within the specified
tolerances. This verification is documented and repeated at intervals to ensure ongoing compliance with the tolerance
requirements.
The assessment area shall be kept as constant as possible since every item can alter the
illumination by absorption or reflection.
5 Determination of shade charts
5.1 Principals of shade creation
Shade charts represent the reference values for the colour and lightness recognition. Since the
recognition is based on classes, the shade chart shall represent the centre point of each class.
For recognition based on 1-dimensional classes (e.g. L*), the values of the defined reference
colour shall be in the centre of the boundaries of each class. This is achieved by mathematically
creating the reference colours along a line in the 3-dimensional CIELAB colour space.
For recognition based on multiple dimensions within the CIELAB colour space, the defined
reference colours shall be located with equal distances within a space defined by at least 3
coordinates. The equal distancing between the defined colours shall be based on at least two
values of the CIELAB system (ISO/CIE 11664-4). This results in a colour gradient with a linear
step size in at least 2 dimensions.
Defined colours shall be printed in accordance with the proof process described in ISO 12647-
7 on matt proofing paper simulating PS5 (print substrate 5 in accordance with ISO 12647-2) as
spot colours. The printed colour samples shall be calibrated with a diffuse eight-degree
geometry, specular component included measurement mode (di:8°) spectrometer in accordance
with CIE 15 and shall be in a range of ∆L* ≤ 1,5 if used as reference colours for the lightness
recognition and ∆E ≤ 5 if used as reference colours for the colour recognition.
___________
Excel is the trade name of a product supplied by Microsoft Corporation. This information is given for the
convenience of users of this document and does not constitute an endorsement by IEC of the product named.
Equivalent products may be used if they can be shown to lead to the same results.
Proof process defined in ISO 12647-7 is referring to spectral measurement defined in ISO 13655
which is (45°:0°) or (0°:45°) geometry and D50 reference illumination. Requirements for colour
measuring instruments in accordance with CIE 15 for (di:8°) and (45°:0°) or (0°:45°) geometry
are stated in Annex A. For proper colour communication, conversion of the colour information
to a reference colour space described in ISO 15076-1 is necessary. Converted values and the
applied conversion models for the exemplary shade charts shown in this document can be found
in Annex B and Annex C.
Created shade charts shall be within the limits of the sRGB colour space.
NOTE 1 Necessary information on transforming the CIEXYZ colour space to sRGB can be found in IEC 61966-2-1
and transforming the CIELAB colour space to the CIEXYZ colour space can be found in ISO/CIE 11664-4.
NOTE 2 Provided shade documents in the supporting documents contain the Fogra 52 profile,
https://www.iec.ch/sc59k/supportingdocuments. This profile includes the required conditions outlined in ISO 12647-
7 and ISO 12647-2.
NOTE 3 For visual assessment of defined colours, the contract proof requirements of ISO 12647-7 for spot colours
are sufficient to indicate colour accuracy, where spot colours are allowed a maximum deviation of 2,5 ΔE 0:45°
respectively 45:0° M1, which is close to the just noticeable difference for human vision, ensuring reliable colour
representation.
5.2 Brown shade charts
Brown shade charts are used to verify the lightness recognition of the digital measurement
system. The relevant value for the brown shade charts is L*.
The ∆L* of each defined colour step shall be equal. To achieve a linear colour gradient between
L*
� �
the defined colours, the a* coordinates shall lie on a line that connects at least 2 (maximum
b*
4) reference colours within the 3-dimensional CIELAB colour space. This results in a uniform
Euclidean distance (∆E* ) of the points that lie on the same line.
ab
As an example, the calculated values of 14 reference colours located on 2 lines based on 3 L*,
a* and b* coordinates are shown in Table 1.
60,7 88,9
L* 27,8
In the example, the 3 defined � � coordinates are � 6,4�, �16,4�, � 2,9�.
a*
4,4 33,0 27,0
b*
Table 1 – Brown shade charts with class limits
Shade L* a* b* ∆L* Lower L* limit for Upper L* limit for ∆E* R G B
ab
No. shade class shade class
17 27,8 6,4 4,4 0 30,15 78 62 59

16 32,5 7,9 8,5 4,7 30,15 34,85 6,4 93 72 63
15 37,2 9,3 12,6 4,7 34,85 39,55 6,4 109 82 67
14 41,9 10,7 16,7 4,7 39,55 44,25 6,4 125 92 71
13 46,6 12,1 20,8 4,7 44,25 48,95 6,4 141 102 76
12 51,3 13,6 24,8 4,7 48,95 53,65 6,4 157 113 80
11 56,0 15,0 28,9 4,7 53,65 58,35 6,4 174 124 84
10 60,7 16,4 33,0 4,7 58,35 63,05 6,4 190 135 88
9 65,4 14,1 32,0 4,7 63,05 67,75 5,3 200 148 101
8 70,1 11,9 31,0 4,7 67,75 72,45 5,3 210 162 115
7 74,8 9,6 30,0 4,7 72,45 77,15 5,3 219 177 128
6 79,5 7,4 29,0 4,7 77,15 81,85 5,3 229 191 142
5 84,2 5,1 28,0 4,7 81,85 86,55 5,3 238 205 156
4 88,9 2,9 27,0 4,7 86,55 100,00 5,3 248 220 171
The proof process defined in ISO 12647-7 is referring to the spectral measurement defined in
ISO 13655, which is (45°:0°) or (0°:45°) geometry and D50 reference illumination. For proper
colour communication, conversion of the colour information to a reference colour space
described in ISO 15076-1 is necessary. Converted values and the applied conversion models
for the shade charts shown in Table 1 can be found in Annex B.
5.3 Green shade charts
Green shade charts are used to verify the colour recognition of the digital measurement system.
The relevant value for the green shade charts is CIELAB hue angle (h ) which is the arcus
ab
tangent of b* and a* axis in the CIELAB colour space in degrees.
The CIELAB hue angle difference of each defined colour step shall be equal. For each defined
CIELAB hue angle step, a linear colour gradient between the defined colours the HLC (h , L*
ab
and C* ) coordinates shall lie on a line that connects at least 2 reference points.
ab
Mathematically created colours within a radius of ∆E* ≤ 2,5 towards each other are not
ab
considered for the printing process, since these differences cannot be adequately reproduced
by the proof printing process.
As an example, the calculated values of 43 reference colours located on 7 lines based on 3
HLC coordinates are shown in Table 2.
Fix points of the individual colour gradients are set by h , L* and C* .
ab ab
h
ab
h h
ab ab
*
The example colour gradient coordinates in � � are from � �, � � where the defined
L 25 60
*
10 60
C
ab
CIELAB hue angle steps for the green shades are from h = 88° to h = 130° with a step size
ab ab
of 7°, giving a total of 7 individual colour gradients.
The colours on the colour gradients can be extracted by defining either L* or C* steps. As an
ab
example, colours are extracted from the colour gradients with an L* step size of 5 are calculated
and shown in Table 2.
The step size of 5 results in 49 colours, of which 6 shall be disregarded since the distance
between the colours is ∆E* ≤ 2,5.
ab
The proof process defined in ISO 12647-7 is referring to spectral measurement defined in
ISO 13655, which is (45°:0°) or (0°:45°) geometry and D50 reference illumination. For proper
colour communication, conversion of the colour information to a reference colour space
described in ISO 15076-1 is necessary. Converted values and the applied conversion models
for the exemplary shade charts shown in Table 2 can be found in Annex C.
NOTE To guarantee accurate and repeatable determination of pixelwise hue angles >130°, which are subsequently
averaged for segment classification into the predefined shade classes, 4 additional reference colours with hue angles
greater than 130° have been introduced exclusively for calibration purposes (cal1 to cal4). These extra shades serve
only as reference points in the system’s colour mapping algorithm, ensuring that the full spectrum of observed hues
is represented during calibration.
Table 2 – Green shade charts
*
Shade h L* a* b* R G B
𝑪𝑪
ab ab
cal1 144° 40,0 −26,9 19,5 33,2 56 105 61
cal2 144° 50,0 −39,4 28,6 48,7 54 135 67
cal3 137° 35,0 −18,6 17,4 25,5 61 90 53
cal4 137° 45,0 −30,0 27,9 41,0 67 118 57
a1 130° 55,0 −34,0 40,5 52,9 91 146 56
a2 130° 50,0 −29,4 35,0 45,7 86 131 55
a3 130° 45,0 −24,8 29,6 38,6 80 116 54
a4 130° 40,0 −20,2 24,1 31,4 74 102 53
a5 130° 35,0 −15,6 18,6 24,3 67 89 51
a6 130° 30,0 −11,0 13,1 17,2 61 75 49
a7 130° 25,0 −6,4 7,7 10,0 54 62 47
b1 123° 55,0 −28,8 44,3 52,9 104 143 48
b2 123° 50,0 −24,9 38,3 45,7 96 129 49
b3 123° 45,0 −21,0 32,4 38,6 88 115 49
b4 123° 40,0 −17,1 26,4 31,4 80 101 49
b5 123° 35,0 −13,2 20,4 24,3 72 87 48
c1 116° 55,0 −23,2 47,5 52,9 116 141 41
c2 116° 50,0 −20,0 41,1 45,7 107 127 44
c3 116° 45,0 −16,9 34,7 38,6 97 113 45
c4 116° 40,0 −13,8 28,3 31,4 87 100 46
c5 116° 35,0 −10,7 21,8 24,3 77 86 46
c6 116° 30,0 −7,5 15,4 17,2 68 73 46
c7 116° 25,0 −4,4 9,0 10,0 58 61 45
d1 109° 55,0 −17,2 50,0 52,9 128 138 36
d2 109° 50,0 −14,9 43,2 45,7 116 125 39
d3 109° 45,0 −12,6 36,5 38,6 105 111 42
d4 109° 40,0 −10,2 29,7 31,4 93 98 43
d5 109° 35,0 −7,9 23,0 24,3 82 85 44
*
Shade h L* a* b* R G B
𝑪𝑪
ab ab
e1 102° 55,0 −11,0 51,7 52,9 138 135 32
e2 102° 50,0 −9,5 44,7 45,7 125 122 36
e3 102° 45,0 −8,0 37,7 38,6 112 109 40
e4 102° 40,0 −6,5 30,8 31,4 100 96 42
e5 102° 35,0 −5,1 23,8 24,3 87 84 43
e6 102° 30,0 −3,6 16,8 17,2 74 72 44
e7 102° 25,0 −2,1 9,8 10,0 62 60 44
f1 95° 55,0 −4,6 52,7 52,9 148 132 30
f2 95° 50,0 −4,0 45,6 45,7 134 119 35
f3 95° 45,0 −3,4 38,4 38,6 120 107 39
f4 95° 40,0 −2,7 31,3 31,4 105 94 41
f5 95° 35,0 −2,1 24,2 24,3 91 82 43
g1 88° 55,0 1,8 52,8 52,9 158 128 30
g2 88° 50,0 1,6 45,7 45,7 142 116 35
g3 88° 45,0 1,3 38,6 38,6 127 104 39
g4 88° 40,0 1,1 31,4 31,4 111 92 41
g5 88° 35,0 0,8 24,3 24,3 96 81 43
g6 88° 30,0 0,6 17,1 17,2 81 70 44
g7 88° 25,0 0,3 10,0 10,0 65 59 44
6 Measurements
6.1 Verification of evenness
The lightness value L* of a uniform-coloured shade chart shall be measured over the entire
surface to be analysed, for example, the size of the baking sheet or one circular object with a
diameter of (68 ± 2) mm. The shade chart shall be coloured in shade number 10 (in accordance
with ISO 12647-7), which is defined in Table 1.
The mean value of the lightness value L* over the entire surface is determined. More than 90 %
of the entire surface may deviate from the mean value by up to ± 2,2 %. Less than 10 % of the
entire surface may deviate by up to ± 3,5 %.
2 2
The entire surface is divided into 1 cm sections. None of the mean values of the 1 cm sections
shall deviate by more than ± 2,2 % of the mean value of the entire surface.
Squared colour samples with a length of (60 ± 2) mm and width of (60 ± 2) mm can be used as
well.
NOTE 1 Shade number 10 is used to check the quality of the illumination as it is the most desired shade.
NOTE 2 Each IUT can be measured separately.
NOTE 3 The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments.

6.2 Lightness recognition (L* values)
6.2.1 Description of the test samples
Flat circular printed colour samples in accordance with ISO 12647-7 with a diameter of (68 ± 2)
mm in every shade number defined in Table 1 are used. They are placed at a height of the top
side of the IUT (± 50 mm), in order to ensure that the light conditions and the focal length which
will be used during the assessment are comparable.
Squared colour samples with a length of (60 ± 2) mm and width of (60 ± 2) mm can be used
alternatively.
NOTE The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments.
6.2.2 Procedure
The shade numbers defined in Table 1 shall be confirmed in all positions of the assessment
area. This is ensured using the following check.
The lightness value L* of the calibrated colour samples shall be measured in several positions
within the assessment area. The positions are defined as follows.
The width and the depth of the assessment area are measured in mm. The minimal number of
positions along its sides is calculated by dividing the width and depth by 140 and then adding
0,5.
The numbers are rounded up to give a whole number of positions. Multiply the positions from
the depth and the width to give the total number for the whole assessment area.
The first and last positions per row and column shall touch two of the borders of the assessment
area. The remaining positions are distributed evenly on the assessment area.
To ensure accurate evaluation results, all defined positions shall be fully populated with the
defined IUTs. This is necessary to replicate light absorption and reflection characteristics
comparable to those in the actual test scenario. Furthermore, any surfaces that are not covered
shall either be the standard background or a background with similar properties to maintain
consistency in the test environment.
EXAMPLE A width of 470 mm divided by 140 mm equals 3,4, adding 0,5 equals 3,9. This gives 4 positions per row.
A depth of 370 mm divided by 140 mm equals 2,6, adding 0,5 equals 3,1. This gives 4 positions per column.
Therefore, the total number of positions in the assessment area is 16.
NOTE Annex E shows exemplary sketches for the correct positioning.
6.2.3 Evaluation (requirements and tolerances)
The CIE lightness value L* of each of the calibrated colour samples shall be measured with the
deviations of ± 2,0 to the calibrated values of the calibrated measured colour sample of the
same shade.
All raw colour channel values of the measured colour sample shall remain within the allowable
range and shall not reach their minimum (e.g. 8-bit sRGB > 0) or maximum (e.g. 8-bit sRGB <
255) limits.
6.3 Colour recognition (L*, a*, b* values)
6.3.1 Description of the test samples
Flat circular printed colour samples (in accordance with ISO 12647-7) with a diameter of (68 ±
2) mm in every shade number defined in Table 2 are used. They are placed at a height of the
top site of the IUT (± 50 mm), to ensure that the light conditions and the focal length, which will
be used during the assessment, are comparable.
Squared colour samples with a length of (60 ± 2) mm and width of (60 ± 2) mm can be used
alternatively.
NOTE The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments.
6.3.2 Procedure
The shade numbers defined in 5.3 shall be confirmed in all positions of the surface to be
assessed. This is ensured using the following check.
The L*, a* and b* of the calibrated colour samples shall be measured in several positions within
the assessment area. The same positions are applied as defined in 6.2.2.
6.3.3 Evaluation (requirements and tolerances)
The L*, a*, and b* of the calibrated colour samples shall be measured with a maximum deviation
of ∆E ≤ 3 to the calibrated values of the calibrated measured colour sample of the same
shade.
All raw colour channel values of the measured colour sample shall remain within the allowable
range and shall not reach their minimum (e.g. 8-bit sRGB > 0) or maximum (e.g. 8-bit sRGB <
255) limits.
6.4 Verification of the measurement area
6.4.1 General
This test shows the ability to ensure that only the surface of the IUT, e.g. the surface of toast
slices or the bottom surface of small cakes, is taken into account and not the side areas or
shadows.
6.4.2 Description of the test samples
Squared colour samples with a length of (60 ± 2) mm, a width of (60 ± 2) mm and a height of
(10 ± 2) mm coloured in every shade number defined in Table 1 are used.
NOTE The supplementary file for the described method is located at:
https://www.iec.ch/sc59k/supportingdocuments.
6.4.3 Procedure
The top surface area of the defined squared colour samples shall be confirmed in all positions
of the surface to be assessed. This is ensured using the following check.
The top surface area shall be measured in all positions of the surface to be assessed. The
same positions are applied as defined in 6.2.2.
6.4.4 Evaluation (requirements and tolerances)
The evaluated surface of the squared colour samples shall be indicated and shall only include
the top surface of the squared colour samples. It shall be within the range of 100 % to 95 % of
the top surface area calculated by the dimensions of the squared colour samples.
6.5 Verification of the resolution
To ensure a sufficient resolution, use a test chart showing at least three pairs of black and white
lines with a thickness of 1 mm each. The black lines have a lightness value L* of maximum 30,
the white lines have a lightness value L* of at least 90. The lightness value of each single line
is measured and stated, once in the horizontal direction and once under an angle of 45°. The
resolution is sufficient if the measured lightness value L* of each black line does not exceed 45
and the measured lightness value L* of each white line exceeds 85.
Test chart shall be printed in accordance with ISO 12647-7 on matt proofing paper simulating
PS5 (print substrate 5 i
...

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