色コントラストと可読性に関する実験研究

概要

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Color differences in the CIE 1976 L^*a^*b^*color space were scaled by measuring the critical area of detection with a colored patch on a white background. Several colors were selected to all have the same chromatic contrast with the white background but differ from one another in hue. The legibility of numerals painted with the selected colors were evaluated under Gaussian luminance noises. We found that red and green numerals were more legible than yellow and blue ones, despite the equalized chromatic contrast. The results are explained by differences in spatio-temporal resolution limits, which were estimated from the cut-off frequencies of chromatic-contrast sensitivity functions measured for different hues. The following properties of color vision must be kept in mind for coloring a legible display : (1) the low spatio-temporal resolution of chromatic systems compared with that of a luminance system ; (2) the decolorization in the peripheral visualfield ; (3) the deterioration of color discrimination, caused by aging or several types of color deficiencies ; (4) the wavelength-dependent loss of luminance, caused by aging or several types of color deficiencies ; (5) the lower spatio-temporal resolution for yellow and blue relative to red and green.
社団法人照明学会の論文
2000-11-01