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Abstract
This paper outlines a method that gives measures of the absolute colour appearance of a test colour as viewed under a specilied i1luminanl. These parameters are then used to provide a measure of the colour dilTerences between the samples of a set of test colours viewed lirst in a reference. and then a test. situation. rour hue/chroma/lightness indices are calculated for each of the four unique hues. red. yellow. green and blue. These indices are combined to give overall hue. chroma and lightness indices. and an overall index. Examples are given that show how the indices can be applied to assess photographic colour reproduction.