SIST EN ISO 105-A11:2013

SLOVENSKI STANDARD
01-maj-2013
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Textiles - Tests for colour fastness - Part A11: Determination of colour fastness grades
by digital imaging techniques (ISO 105-A11:2012)
Textilien - Farbechtheitsprüfungen - Teil A11: Bestimmung von Farbechtheitszahlen
durch digitale Bildgebungsverfahren (ISO 105-A11:2012)
Textiles - Essais de solidité des teintures - Partie A11: Détermination des degrés de
solidité des teintures par des techniques d'imagerie numérique (ISO 105-A11:2012)
Ta slovenski standard je istoveten z: EN ISO 105-A11:2012
ICS:
59.080.01 Tekstilije na splošno Textiles in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 105-A11
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2012
ICS 59.080.01
English Version
Textiles - Tests for colour fastness - Part A11: Determination of
colour fasness grades by digital imaging techniques (ISO 105-
A11:2012)
Textiles - Essais de solidité des coloris - Partie A11: Textilien - Farbechtheitsprüfungen - Teil A11: Bestimmung
Détermination des degrés de solidité des coloris par des von Farbechtheitszahlen durch digitale
techniques d'imagerie numérique (ISO 105-A11:2012) Bildgebungsverfahren (ISO 105-A11:2012)
This European Standard was approved by CEN on 14 September 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 105-A11:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (EN ISO 105-A11:2012) has been prepared by Technical Committee ISO/TC 38 "Textiles" in
collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of which is
held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2013, and conflicting national standards shall be withdrawn at
the latest by March 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 105-A11:2012 has been approved by CEN as a EN ISO 105-A11:2012 without any
modification.
INTERNATIONAL ISO
STANDARD 105-A11
First edition
2012-09-15
Textiles — Tests for colour fastness —
Part A11:
Determination of colour fastness grades
by digital imaging techniques
Textiles — Essais de solidité des coloris —
Partie A11: Détermination des degrés de solidité des coloris par des
techniques d’imagerie numérique
Reference number
ISO 105-A11:2012(E)
©
ISO 2012
ISO 105-A11:2012(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 105-A11:2012(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
4.1 General . 2
4.2 Digital camera . 2
4.3 Illumination cabinet . 4
Annex A (normative) Assessment of the change in colour of a test specimen . 6
Annex B (normative) Assessment of staining of a test specimen . 9
Annex C (normative) Verification chart .12
Annex D (informative) Summary of report and conclusions of international trial for determination of
colour fastness grades by digital imaging techniques .14
Bibliography .16
ISO 105-A11:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 105-A11 was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 1, Tests for
coloured textiles and colorants.
ISO 105 consists of many parts designated by a part letter and a two-digit serial number (e.g. A01), under the
general title Textiles — Tests for colour fastness. A complete list of these parts is given in ISO 105-A01.
iv © ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 105-A11:2012(E)
Textiles — Tests for colour fastness —
Part A11:
Determination of colour fastness grades by digital imaging
techniques
1 Scope
This part of ISO 105 specifies the requirement for a digital imaging system for use in the methods specified in
Annexes A and B for the determination of change in colour and staining by digital imaging techniques.
This method is not suitable for assessment of colour fastness to light as described in the ISO 105 B series, as
these standards do not use grey scales to assess the specimen.
This part of ISO 105 describes apparatus, equipment settings and calibration for the assessment of
— change in colour, and
— staining.
2 Normative references
The following referenced documents are indispensable for the application 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 105-A01, Textiles — Tests for colour fastness — Part A01: General principles of testing
1)
CIE Publication S 012/E, Standard method of assessing the spectral quality of daylight simulators for appraisal
and measurement of colour
CIE Publication 13.3, 1995, Method of measuring and specifying the colour rendering properties of light
sources, 2nd edition
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
system grey
colour of the internal surfaces and apparatus that would normally be visible in a captured image
NOTE System grey shall be approximately between Munsell N5 and N7 and within CIELAB Lightness value of 50 or
70 ± 2,0 and CIELAB Chroma value not exceeding 2,5 in any hue direction under D65 and CIE 1964 standard colorimetric
observer, respectively.
1) Commission Internationale d’Éclairage, Central Bureau, Kegelgasse 27, A-1030, Vienna, Austria.
ISO 105-A11:2012(E)
3.2
2)
verification chart
chart consisting of a series of colour patches of known colorimetric values
See Annex C.
3.3
system software
software required to control and operate the digital camera
3.4
white tile
tile whose colour is certified and traceable to a national standard
EXAMPLE Standard provided by the National Physical Laboratory in the UK.
3.5
operator-selected area
assessment for either staining or change in colour where the system operator manually selects both the location
and size of the specimen test area for the reference and tested pieces
3.6
automatic grading
assessment for either staining or change in colour where the system software selects both the location and
size of the specimen test area for the reference and tested pieces
4 Apparatus
4.1 General
3)
The test apparatus consists of a verified digital camera (4.2) , which is mounted on an illumination cabinet
(4.3) that gives a controlled and consistent lighting environment. Specimens may be presented for grading
individually, in multiples, or in one of a series of pre-defined templates depending on the type of test being
carried out. The operator shall manually select the area to be assessed for grading.
Automatic grading (3.6) of specimens is permitted, provided that the grades produced by this method agree
with those achieved by the Operator-Selected Area method (3.5).
The equipment shall be maintained and calibrated or verified, as appropriate, in accordance with the
manufacturer’s instructions.
4.2 Digital camera
4.2.1 Digital camera specification
4.2.1.1 Resolution
The digital camera shall have an effective resolution of not less than 3,0 M pixels.

2) A verification chart as described in 3.2 and Annex C is manufactured commercially as the DigiEye DigiTizer® series
camera calibration chart and is available from VeriVide Limited, Quartz Close, Warrens Business Park, Enderby, Leicester,
LE19 4SG, United Kingdom. Tel: +44 (0) 116 2847790; Email: enquiries@verivide.com This information is given for the
convenience of users of this document and does not constitute an endorsement by ISO of this product.

3) The apparatus as described in Clause 4 with software as described in Annexes A and B manufactured commercially
as the DigiEye® is available from VeriVide Limited, Quartz Close, Warrens Business Park, Enderby, Leicester, LE19 4SG,
United Kingdom. Tel: +44 (0) 116 2847790; Email: enquiries@verivide.com. This information is given for the convenience of
users of this document and does not constitute an endorsement by ISO of this product.
2 © ISO 2012 – All rights reserved

ISO 105-A11:2012(E)
4.2.1.2 Optical zoom
The digital camera shall be capable of capturing the whole of the specimen assessment area in one image.
In order for the image quality to be preserved, any adjustment of the focal length of the camera necessary to
capture a suitable image shall be by optical means rather than digital.
4.2.1.3 PC connection
The camera connection to an external computer is done by using a suitable connection for image capture,
download and camera control.
4.2.1.4 Camera settings
The system software (3.3) shall control all camera settings and shutter release operations needed for routine
setup and imaging. The system software shall have a provision to store and set the operating settings required
for different grading requirements.
4.2.2 Camera mounting
The digital camera shall be mounted on top of the illumination cabinet (4.3) at zero degrees to the normal with
respect to the tested specimen. The camera mounting shall allow adjustment of the camera lens position to
allow parallel alignment to the specimen assessment area.
The height of the camera above the assessment area is such that it will accommodate the required focal length
of the lens and capture the whole of the defined assessment area within the image.
4.2.3 Camera verification
4.2.3.1 General
The function of the camera verification is to verify the camera output for each pixel in an image in terms of
CIE XYZ data. The verification is then applied to all subsequent images used for digital grading. The camera
calibration is done using a digital verification chart as described in Annex C.
4.2.3.2 Verification interval
The camera shall be verified
— at system start-up,
— if the camera settings are changed, and
— at the manufacturer’s recommended verification time interval.
4.2.3.3 Verification time
The time and date of the current verification shall be recorded in the system software and be accessible to the
user. The system software shall indicate to the user when the recommended verification period has expired.
4.2.3.4 Verification performance
The verification performance of the digital method is expressed in terms of repeatability and accuracy. The
results shall be expressed in terms of the median and maximum CIEDE2000 colour difference between
the known and measured values of the digital verification chart. The procedures to conduct these tests are
described below.
The system software shall store a summary of the verification performance for the current verification such that
it is easily retrievable by the user.
ISO 105-A11:2012(E)
4.2.3.5 Accuracy test
The digital imaging apparatus (4.2) shall be verified within the time period as specified by the manufacturer or
at 8 hourly intervals, whichever is sooner.
For each colour patch in the verification chart, the CIEDE2000 colour difference value shall be calculated
between the prediction from the digital method and the measurement from a spectrophotometer which has
been calibrated with white tiles (3.4) certified as traceable to a national standard, such as the National Physical
Laboratory in the UK.
The median and maximum CIEDE2000 colour difference values shall be recorded in the system to represent
the accuracy performance.
The accuracy shall be deemed satisfactory if
— CIEDE2000 maximum is less than 5,0, and
— CIEDE2000 median is less than 1,0.
4.2.3.6 Repeatability test
The repeatability test shall be carried out at frequent intervals in accordance with the manufacturer’s instructions.
Ten consecutive measurements of the verification chart shall be as defined in Annex C. All colour patches used
in the verification routine shall be measured and recorded by the system.
The arithmetic mean values of the CIELAB L*, a*, b*, C* and h attributes shall be calculated for each colour patch.
The CIEDE2000 colour difference values shall be calculated between the mean and each individual
measurement for each colour patch.
The median of the CIEDE2000 colour difference values shall be calculated for each colour patch.
The median and maximum CIEDE2000 colour difference values shall be reported to represent the
repeatability performance.
The repeatability shall be deemed satisfactory if
— CIEDE2000 maximum is less than 1,0, and
— CIEDE2000 median is less than 0,4.
4.3 Illumination cabinet
4.3.1 General
The cabinet shall
— have opaque walls to exclude ambient light,
— be of sufficient area to accommodate the samples being assessed,
— be of a height to provide even illumination, and
— have the lighting configuration and internal surfaces such that the illumination of the specimen area is by
diffuse illumination with no direct illumin
...