Color and brightness constancies depend reciprocally on saturation

Adam Reeves, Kinjiro Amano

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Color and brightness constancies may not be independent, since increasing a sample saturation should decrease the demand on the color constancy and increase that on the brightness constancy [Color Res. Appl. 43, 630 (2018) [CrossRef] ]. We tested this claim using color and brightness constancy data from Foster et al. [Vis. Res. 41, 285 (2001) [CrossRef] ], whose observers made side-by-side and successive comparisons of central patches (“asymmetric matches”) presented in pairs of identical Mondrian displays with simulated illuminants of 25000 K and 6700 K daylights. Saturations (CIE “chroma”) of the central patches varied from 0.007 to 0.092. For most observers (as in a toy Gaussian model of the surface reflectance spectra), increasing saturation reduced color constancy and increased brightness constancy.
Original languageUndefined
JournalOptical Society of America. Journal A: Optics, Image Science, and Vision
Publication statusPublished - 1 Apr 2020

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