1 Scope
This part of ISO 105 provides a colorimetric method for calculating an estimate of the magnitude (and optionally the direction) of the change in the perceived colour of a textile specimen when the chromaticity of the illumination by which it is viewed is changed. It therefore provides an estimate of the colour inconstancy of the specimen.
NOTE 1 Colour inconstancy and metamerism are related but distinct. With respect to a change in the quality of illumination,
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a) colour inconstancy is the extent of change in the colour appearance of a single specimen,
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b) metamerism is the extent of change in the colour difference between two specimens.
This part of ISO 105 therefore provides a method for assessing (a) but not (b).
NOTE 2 Comparison of the results of this method and those from visual assessments is valid only when the visual assessments are made
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a) in lighting of the same spectral power distributions as used in the colorimetric calculations,
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b) with the specimens illuminated at 1 000 lux to 4 000 lux,
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c) by an assessor who is fully adapted to the relevant viewing conditions.