The use of metamers to compare the color vision of observers

In this research we compare the colorimetric behavior of several observers. For color centers recommended by CIE we have produced large sets of spectr al distributions, which are metameric for the CIE 1931 standard observer. F or each one of the color centers, we compare the clouds of chromaticity coo rdinates with the chromaticity, thresholds. We define a parameter that prov ides a quantitative measure of the interobserver variability. This paramete r is used to arrange the observers by their degree of likeness. A similar p rocedure has been used to compare two real observers. It is shown how there is no reciprocity between the colorimetric behavior of two real observers. (C) 2001 John Wiley & Sons, Inc.