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.

© 1963 Optical Society of America

Simple Graphical Conversion of Colorimetric Ratios to Chromaticity Differences; Application to Determination of Chromaticity Difference for Near-White Samples

Eugene Allen
J. Opt. Soc. Am. 53(9) 1107-1113 (1963)

Chromatic Adaptation. II. Nonlinear Hypothesis*

David L. MacAdam
J. Opt. Soc. Am. 53(12) 1441-1445 (1963)

Evaluation of Single-Number Expressions of Color Difference*

Angela C. Little
J. Opt. Soc. Am. 53(2) 293-296 (1963)

Lines of Constant Correlated Color Temperature Based on MacAdam’s (u,υ) Uniform Chromaticity Transformation of the CIE Diagram

Kenneth L. Kelly
J. Opt. Soc. Am. 53(8) 999-1002 (1963)

Paired Comparisons of Color Differences

Y. Suoiyama and Hilton Wright
J. Opt. Soc. Am. 53(10) 1214-1222 (1963)