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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • 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)

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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

Original Manuscript: September 29, 2003
Revised Manuscript: December 9, 2003
Manuscript Accepted: December 9, 2003
Published: May 1, 2004

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)

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