The Relation between the Color Depth Sensation "Kuromi" and "Fukami" of Colored Material

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概要

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• In a previous paper, we carried out a subjective evaluation by paired comparison to examine the contribution of three color attributes to "Fukami", and then to form the "Fukami" scale. We found that "Fukami" is related to the decrease in value and chroma, and also that it depends on the difference in hue. After the evaluation, it was reported that "Fukami" was depended on the degree of color depth sensation. We took notice of this fact. First, we studied the relationship between "Fukami" and the color depth sensation. For both sensations, there were many similar tendencies for the change in value and the difference in hue. But for low values and chromatic color areas, the contribution of the chroma to each sensation was opposite, therefore we could not find a good relation between them. Next, we defined the "Kuromi" sensation based on the color depth sensation and examined the relation to "Fukami". We verified that the "Kuromi" (K_L^*) increased with the increase in color depth sensation and the decrease in chroma. The fundamental relation model between "Fukami" and "Kuromi" is described as follows. Fukami=K_h(K_L^*-δ_h) [δ_h≦K_L^*≦10] K_h and δ_h are calculated from the hue (dH_<5p>). This equation is very simple and explicates the effect of "Kuromi" in relation to "Fukami". But, the equation has the tendency to shift the "Fukami" peak from hue GY to hue BG, of equal value, with the decrease in chroma. So, we consider it necessary to improve the equation for practical use.

• 社団法人照明学会の論文

著者

• Hazama Yoshihiko

  Kyoto Institute Of Technology

• OHAGI Shigeo

  Wakayama Industrial Technology Center

• NISHIMURA Takeshi

  Kyoto Institute of Technology

関連論文

• The Relation between the Color Depth Sensation "Kuromi" and "Fukami" of Colored Material

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