WHITENESS BLACKNESS AND BRIGHTNESS RESPONSE IN A NONLINEAR COLOR-APPEARANCE MODEL

The achromatic response of the nonlinear color-appearance model is developed to predict the preceptions of whiteness-blackness, brightness, and lightness of object colors. The distinction between whiteness-blackness and brightness perceptions of achromatic colors is important in an adapting condition with nonuniform illumination or in a haploscopic match between different adapting fields. In the whiteness-blackness response, the reference gray is introduced from the viewpoint of opponency of achromatic response.