Predicting corresponding colors with changes in adaptation

Abstract

AbstractA method is proposed for determining chromaticity coordinates of stimuli that elicit the same colors over changes in chromatic adaptation. The method uses equations derived from a recent study of the influence of chromatic adaptation on color appearance. A single set of König‐type fundamental primaries is used, and the “red” and “green” fundamentals are altered by changes in adaptation according to a coefficient rule while, in addition, the “blue” fundamental is modified through a power transform. No ulterior information is required beyond a knowledge of the chromaticities of samples and illuminants. The method agrees well with the experimental data from which it was derived, with predictions from a number of other transformation methods, and with raw data from five independent studies of chromatic adaptation. The method thus offers utility and a reasonable compromise between generality and simplicity on the one hand and accuracy on the other.