Individual differences in the color matches made by normal observers can be attributed in part to small interobserver variations in the spectral peaks (λmax) of the cone sensitivities. I compared two different analyses of these λmax variations that were both based on the Stiles–Burch 10° color-matching functions [Opt. Acta 6, 1 ( 1959)]: one that suggested that the λmax values for individual cone classes fall into discrete subgroups [J. Neitz and G. H. Jacobs, in Colour Vision Deficiencies IX, B. Drum and G. Verriest, eds. (Kluwer Academic, Dordrecht, The Netherlands, 1989)] and one that failed to find discrete clustering [ J. Opt. Soc. Am. A 5, 1722 ( 1988)]. I conclude that there is not strong evidence for discrete λmax variations in the Stiles–Burch matches.
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