SIST EN 15886:2010

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Erhaltung des kulturellen Erbes - Prüfmethoden - Farbmessung von matten OberflächenConservation des biens culturels - Méthodes d'essai - Mesurage chromatique des surfacesConservation of cultural property - Test methods - Colour measurement of surfaces97.195Umetniški in obrtniški izdelkiItems of art and handicrafts17.040.20Lastnosti površinProperties of surfacesICS:Ta slovenski standard je istoveten z:EN 15886:2010SIST EN 15886:2010en,fr01-december-2010SIST EN 15886:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15886
September 2010 ICS 97.195 English Version
Conservation of cultural property - Test methods - Colour measurement of surfaces
Conservation des biens culturels - Méthodes d'essai - Mesurage chromatique des surfaces
Erhaltung des kulturellen Erbes - Prüfmethoden - Farbmessung von matten Oberflächen This European Standard was approved by CEN on 7 August 2010.
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 Management Centre or to any CEN member.
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The method is suitable for the measurement of colour coordinates of:  representative surfaces of specimens, see 3.11;  representative surfaces of objects, indoors or outdoors. 2 Normative references The following referenced documents are required for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) apply. prEN 15898:2010, Conservation of cultural property
Main general terms and definitions concerning conservation of cultural property 3 Terms and definitions For the purposes of this document, the terms and definitions given in prEN 15898:2010 and the following apply. 3.1 porous inorganic materials natural stones as well as artificial materials such as mortar, plaster, brick and others 3.2 chroma attribute of colour used to indicate the degree of departure of the colour from a grey of the same lightness
NOTE See ASTM E 284. 3.3 lightness
attribute by which a perceived colour is judged to be equivalent to one of a series of greys ranging from black to white
NOTE See ASTM E 284. 3.4 hue
attribute of a visual perception according to which an area appears to be similar to one of the colours, red, yellow, green, and blue, or to a combination of adjacent pairs of these colours considered in a closed ring
NOTE See the International Commission on Illumination CIE (1931) 3.5 reflectance factor
R% percentage ratio of the reflected radiant power compared to incident radiant power SIST EN 15886:2010

NOTE The interpretation of numerical data is connected directly to visual perception. It is based on the principle that colours are obtained by mixing together the three imaginary colour as primaries defined X, Y, Z. These primaries define the reference frame in the tristimulus space and any set (X,Y,Z) is a vector in this space. The principal property of the reference frame is that the Y component is the luminance factor, generally given on a percentage scale.
3.8 CIE 1931 standard colorimetric observer average observer whose colour matching properties correspond to the CIE colour matching functions for the 2° field size 3.9 CIE 1964 standard colorimetric observer average observer whose colour matching properties correspond to the CIE colour matching functions for the 10° field size 3.10 CIE L*a*b* colour space 1976 mathematical transformation of the CIE XYZ space into a metric space
NOTE 1 See Figure 1.
NOTE 2 The L*a*b* system is useful for calculations of colour differences because it allows them to be defined by numerical values. NOTE 3 In the CIE L*a*b* colour space the colour coordinates in this rectangular coordinate system are:
 L* - the lightness coordinate. The scale for L* ranges from 0 (black) to 100 (white);  a* - the red/green coordinate, with +a* indicating redness and -a* indicating greenness;  b* - the yellow/blue coordinate with +b* indicating yellowness and -b* indicating blueness.
a*b*L*f Figure 1 — L*a*b* colour space SIST EN 15886:2010

3.11
specimen part considered representative of the material constituting an object.
NOTE 1 The specimen can have different origins and can be taken from:  materials similar to those constituting the object under study (e.g. stone quarries);  reference materials, for instance, specifically prepared compa
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