比率評定法による標準の光Aおよび昼光D_<65>で照明された色票の知覚される色差と測色上の色差との比較

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The CIE recommended, after the 18th Session held at London on 1975, the CIE 1976L^*U^*V^* uniform colour space and the CIE 1976 L^*a^* b^* uniform colour space in an attempt to improve the correlation properties of perceived colours and colour-differences to colorimetric ones. The further investigation, however, to determine which of these two uniform colour spaces approximates more closely the perceived colours and colour-differences is to be performed by means of psychological visual experiment. In this study the relations of the perceived colourdifferenes to the colorimetric ones of colour chips with equal lightness and equal chroma under standard illuminant A and daylight illuminant D_65 are examined in terms of ratio estimation method. Results obtained are as follows. 1) The colour chips used in this psychological visual experiment have the lightness of 6 or thereabout, the saturation of 2 to 4 and the hue of 2.5 Y to 2.5 PB in Munsell colour space. 2) When the colour chips are illuminated by the daylight illuminant D_65, the ratios of the perceived colour-differences to the colorimetric ones are within the range of 0.74 to 2.04 in the L^*u^*v^* space and of 0.96 to 2.31 in the L^*a^*b^* space. 3) The variations of the relative values of the perceived colour differences are within ± 16%, even though the illuminant illuminating the colour chips is changed from the daylight illuminant D_65 to the standard illuminant A. 4) The values of chromaticity co-ordinates and colorimetric colour-differences in the L^*u^*v^* space vary considerably with the illuminant; and these variations do not much accord with the constancy of the perceived colour-differences caused by the chromatic adaptation of visual system.
日本色彩学会の論文
1978-07-07

比率評定法による標準の光Aおよび昼光D_<65>で照明された色票の知覚される色差と測色上の色差との比較

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