An instrument has been constructed in which colors seen under various conditions of direct viewing by the left eye can be matched for color appearance by adjusting the proportions of a red, green and blue mixture seen by the right eye in the center of an adapting field of 1000 ft-L at a color temperature of 4000°K. The instrument has been used for measuring the appearance of the colors of a chart under various viewing conditions ranging from bright sunlight out of doors to ordinary tungsten room lighting. It was found that adaptation only partially corrected for changes in the color and intensity of adapting illuminations, and, in addition, colors lost saturation markedly as the adapting intensity was lowered. It was also found that, if viewed by tungsten light in a dark room, a color reproduction having the same spectral reflectance curves as the original would appear to be appreciably more orange, darker, and less saturated than the original when viewed in sunlight.

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