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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 21, Iss. 5 — May. 1, 2004
  • pp: 677–682

Color opponencies in the system of the uniform color scales of the Optical Society of America

Claudio Oleari  »View Author Affiliations


JOSA A, Vol. 21, Issue 5, pp. 677-682 (2004)
http://dx.doi.org/10.1364/JOSAA.21.000677


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Abstract

Many problems regarding color opponency are still unsolved. In this study the system of the uniform color scales of the Optical Society of America (OSA-UCS) is analyzed with the aim of obtaining answers to very general questions on color opponency. The perceptual color opponencies in the OSA-UCS system, represented by its coordinates (j, g), appear to work in a mutually interacting way. On the hypothesis that such an interaction is due to a linear mixing of a pair of independent opponent mechanisms with scales satisfying a proper Weber fraction, three chromatic opponency functions are derived, whose sum is equal to zero. These functions are the logarithms of the ratios of two tristimulus values in a proper reference frame (called the “main reference frame”) and therefore are antisymmetric and zero-degree homogeneous functions of these tristimulus values. Any pair of these three functions is a set of two independent functions. A new formula for color opponency in the OSA-UCS system is derived in which the perceptual color opponencies (j, g) are written as products of the lightness by a proper linear mixing of any pair of the three chromatic opponency functions. All this is possible because the lattice of the OSA-UCS system is composed of geodesic lines.

© 2004 Optical Society of America

OCIS Codes
(330.1720) Vision, color, and visual optics : Color vision
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics

Citation
Claudio Oleari, "Color opponencies in the system of the uniform color scales of the Optical Society of America," J. Opt. Soc. Am. A 21, 677-682 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-5-677

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