Visual comfort, which is defined here as the subjective impression of comfort caused by visual stimuli, to a colored image presented on a CRT display was investigated in terms of the distribution of CIE 1976 u,v saturation, s(uv), over the image. Variable saturation experiments, where the observer was asked to adjust saturation of the whole image to the most comfortable point, showed that saturation is a critical factor in the observer＇s estimation of comfort. Colorimetric analysis of the saturation distribution of the image showed that the mean value of s(uv) over the image has a negative correlation to visual comfort, meaning that the lower the mean saturation, the more comfort is felt when viewing the image. The ratio of the higher to lower saturation components of the image, which means how much saturated color is relatively contained in the image, was also shown to be a critical factor affecting visual comfort.