Abstract
Change of color appearance of invariant psychophysical color, namely a color of same chromaticity coordinates, was investigated. A subject observed a color chip placed in a test room illuminated white through a small window from a subject room illuminated by white, red, yellow, green, or blue light and assessed the color of the chip by the elementary color naming. With the white light he perceived the original color of the chip and with colored lights he perceived color after the chromatic adaptation to the light in the subject room. The color appearance shown on the polar diagram used in the opponent color theory indicated that the color of chips shifted away from the adapting color.
