Abstract

Psychometric scale values for color differences are correlated with physically measured chromaticity differences by use of a formula which postulates that the scale values are proportional to some power, less than unity, of distance in a subjectively isotropic, projective transformation of the CIE chromaticity diagram. Exponents ranging from 0.38 to 0.80 are reported. Eleven to 37% smaller root-mean-square errors of fit to psychometric scale values are obtained with the nonlinear hypothesis than with a linear hypothesis.

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  1. D. L. MacAdam, J. Opt. Soc. Am. 33, 18โ€“26 (1943).

MacAdam, D. L.

D. L. MacAdam, J. Opt. Soc. Am. 33, 18โ€“26 (1943).

Other (1)

D. L. MacAdam, J. Opt. Soc. Am. 33, 18โ€“26 (1943).

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