Abstract
We attempted to analyze quantitatively the cool-warm feeling of color one of the most fundamental affections, in terms of colorimetric value which is supposed to correlate with the affective tone of color. We performed a visual experiment where either “cool” or “warm” was to be selected from the specimens selected systematically in the color space. The results confirmed that the cool-warm feeling was affected by hue and brightness rather than by hue and chroma. The visual evaluation was compared with the hue and brightness calculated from the colorimetric values, and the following empirical formula was found to represent the cool-warm indices (CW), CW=aBr-80 where Br denotes the brightness value. The coefficient a is given by a=20 {cos (π×ΔH5YR/50)+1} where ΔH5YR is the Munsell hue step from 5YR (0_??_ΔH5YR_??_50). The index CW is in the range from -100 to 100, and the value of its correlation coefficient with visual evaluations was found to be higher than 0.92.
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