A Study on Whiteness of Light Source Color

Abstract

The studies of whiteness have been so far done for the object mode color. This article deals with whiteness of a light source color. The psychological content of the whiteness was defined as the perceptual preference of white. It was found that perceptual brightness and colorlessness contributed to perceptual whiteness and that the perceptual brightness depended on the chromaticities of light sources only if the range of luminance was relatively small. In this experiment, the perceptual colorless point was calculated in the uniform color space and the degree of the perceptual colorlessness was defined as the distance from this point. The whitenessformula for light source color was developed by multiple regression analysis.