The use of metamers to compare the color vision of observers

Interobserver variability and color representation systems

“…(5) in Ezquerro et al 10 The reference color stimuli used in this work (X 1 st,l , X 2 st,l , X 3 st,l ), are those suggested by the CIE 19 : (l ϭ A, B, . .…”

“…It is shown that, when the transforming operator is applied, the differences between the colorimetric behavior of two sets of cmf's are less than when they are compared in the original CRSs. Note that Esquerro et al 10 have shown the nonreciprocity between the colorimetric behavior of two real observers. This result confirms the assertion by Zoido 11 concerning to the two components of the interobserver variability: The first is associated with the differences in color-vision mechanisms; the second component is the result of the representation of the experimental results in different CRSs.…”

“…The evaluation of these differences can be carried out in two ways: by analyzing the similarity between the corresponding sets of cmf's, 6 -8 or by studying the differences among the tristimulus values obtained when a given set of color centers is considered. 5,9,10 A new method 9 for evaluating the colorimetric similarity or differences between two sets of cmf's has been proposed. It is based on the definition of the characteristic matrix associated with a particular set of cmf's.…”

Mathematical determination of the numerical data corresponding to the color‐matching functions of three real observers using the RGB CIE‐1931 primary system and a new system of unreal primaries X′Y′Z′

“…These cmf's have been used by us in several experiments published in different works, 1,2,12 and by other authors [15][16][17] to whom J. A. Martínez had privately communicated the corresponding numerical data, which these authors cite as G94 (Granada '94).…”

Theoretical considerations on small color differences ascribed to the standard observer made on the basis of individual color‐matching functions

“…3 Furthermore, they provide a convincing demonstration of how the variability of cmf's not only influences the absolute perception of physical stimuli, but the evaluation of small color-differences.…”