Abstract

The chromatic difference given by the FMC color-difference formula is separated into yellow–blue and red–green chromatic differences. The rates of change of lightness and chromatic differences with change of CIE tristimulus value differences are then calculated. The results, nine partial derivatives, are plotted on 1931 CIE chromaticity diagrams. The red–green chromatic difference is most sensitive; variations less than 0.22 (out of 98) of ΔX, anywhere in color space, are sufficient to cause a perceptual change of at least 1.0 MacAdam unit. For many colors of practical interest a 0.02 variation causes a 1.0 MacAdam unit change; a fact which should concern instrument manufacturer, instrument user, and tolerance setter alike.

© 1969 Optical Society of America

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