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BS EN ISO 18314-4:2021

BS EN ISO 18314-4:2021

$142.49

Analytical colorimetry – Metamerism index for pairs of samples for change of illuminant

Published By Publication Date Number of Pages
BSI 2021 30
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This document specifies a formalism for the calculation of the illuminant metamerism of solid surface colours. It cannot be applied to colours of effect coatings without metrical adaptation.

This document only covers the phenomenon of metamerism for change of illuminant, which has the greatest meaning in practical application. In the case of chromaticity coordinates of a pair of samples under reference conditions that do not exactly match, recommendations are given on which correction measures are to be taken. Regarding the reproduction of colours, the metamerism index is used as a measure of quality in order to specify tolerances for colour differences between a colour sample and a colour match under different illumination conditions.

The quantification of the illuminant metamerism of pairs of samples is formally performed by a colour difference assessment, for which tolerances that are common for the evaluation of residual colour differences can be used.

NOTE In the colorimetric literature and textbooks, the term geometric metamerism is sometimes used for the case that two colours appear to be the same under a specific geometry for visual assessment and selected standard observer and standard illuminant pair, but is perceived as two different colours at changed observation geometry. The term geometric metamerism is different to metamerism described in this document.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Symbols and abbreviated terms
11 5 Reference illuminant
6 Test illuminant
7 CIELAB coordinates L*, a*, b*
12 8 Metamerism index for change in illuminant
8.1 General calculation methods
8.2 Basic calculation of the metamerism index from colour differences
13 8.3 Correction methods
8.3.1 Additive correction
8.3.2 Multiplicative correction
8.3.3 Spectral correction
17 8.4 Test report
18 Annex A (informative) Calculation examples
29 Bibliography

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BS EN ISO 18314-4:2021
$142.49