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Metameric Color Stimuli, Fundamental Metamers, and Wyszecki's Metameric Blacks

Jozef B. Cohen and William E. Kappauf
The American Journal of Psychology
Vol. 95, No. 4 (Winter, 1982), pp. 537-564
DOI: 10.2307/1422186
Stable URL: http://www.jstor.org/stable/1422186
Page Count: 28
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Metameric Color Stimuli, Fundamental Metamers, and Wyszecki's Metameric Blacks
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Abstract

In 1953, Wyszecki described radiometric functions as composed of two components -- a fundamental color-stimulus function and a metameric black function. The present paper discusses procedures for accomplishing the decomposition or resolution of any visual stimulus into these components. These methods rest on the fact that the color-stimulus space is a space of three dimensions and the metameric black space is orthogonal to it. Introduced and given specific attention here is the particular procedure wherein the stimulus-energy vector is premultiplied by A(A′ A)-1A′, A being any matrix of experimentally established color-mixture data with three linearly independent columns (primaries). This computation provides the fundamental metamer (as we shall call it) of the visual stimulus being analyzed. The difference between the stimulus-energy distribution and the fundamental metameric function provides the metameric black function. Examples of both types of functions are given and discussed.

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