Abstract
The effect of changed chromatic adaptation of the eye under source A (incandescent-lamp light), as compared with its adaptation under source C (average daylight) has been approximately explained by Helson, Judd, and Warren by means of a form of three-components theory. By this theory, each object-chromaticity point (x,y) for source A determines a corresponding object-chromaticity point (x′,y′) from which the predicted chromaticness (hue and saturation) of the color perception is read by interpolation in the Munsell renotation system. The present paper gives a geometrical interpretation of the theory directly in terms of the CIE chromaticity diagram, whereby without any computation it is possible to find the corresponding object-chromaticity point (x′,y′). The basic data for such an interpretation are given, not only for adaptation to source A, but also for adaptation to any source whatever.
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