Contribution of Chromaticness and Achromaticness to Equivalent Lightness at Various Illuminance Levels

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  • Yujiri Akira
    Department of Electrical Engineering, Hiroshima Institute of Technology

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  • 照度レベルによる色の見えの等価明度への寄与
  • ショウド レベル ニ ヨル イロ ノ ミエ ノ トウカ メイド エ ノ キヨ

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To investigate the relationship between the equivalent lightness and the color appearance of colored objects, 39 colored chips were used as stimuli to measure the equivalent lightness and the three attributes of whiteness, blackness and chromaticness at illuminance levels from 0.01 to 3000 lx. The first method, which has already been reported by the authors, is the determination of the equivalent lightness of colored objects by using heterochromatic brightness matching. In this paper, the color appearance of a colored object was measured by the values of its whiteness, blackness and chromaticness. It was observed that the whiteness corresponding to illuminance is directly related to the theoretical achromatic lightness, and the chromaticness corresponding to illuminance is also directly related to chromatic lightness. Consequently, the equivalent lightness corresponding to illuminance can be explained by adding the chromaticness to the whiteness.

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