Abstract

The tristimulus values of a small (foveal) spot which appears achromatic to an eye which is adapted to a uniform chromatic background have been found experimentally. Various colors have been used for the background, and a considerable range of luminances has been employed for both the background and the spot. It is found that the chromaticity coordinates of the achromatic spot can be predicted by interpolation between the coordinates of a “white point,” which is independent of the state of adaptation, and those of the background. An empirical interpolation formula, which expresses the effect of adaptation as a function of the tristimulus values of the background and the achromatic spot, is presented.

© 1948 Optical Society of America

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