In a previous paper, we carried out a subjective evaluation by paired comparison to examine the contribution of three color attributes to ldquo;Fukamirdquo;, and then to form the ldquo;Fukamirdquo; scale. We found that ldquo;Fukamirdquo; 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 ldquo;Fukamirdquo; was depended on the degree of color depth sensation. We took notice of this fact.First, we studied the relationship between ldquo;Fukamirdquo; 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 ldquo;Kuromirdquo; sensation based on the color depth sensation and examined the relation to ldquo;Fukamirdquo;. We verified that the ldquo;Kuromirdquo; (KL*) increased with the increase in color depth sensation and the decrease in chroma. The fundamental relation model betweenldquo;Fukamirdquo; and ldquo; Kuromirdquo; is described as follows.Fukami=Kh (KL*-delta;h) delta;hle;KL*le;10Kh and delta;h are calculated from the hue (dH5p). This equation is very simple and explicates the effect of ldquo;Kuromirdquo; in relation to ldquo;Fukamirdquo;. But, the equation has the tendency to shift the ldquo;Fukamirdquo; 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.
展开▼
