One of the important characteristic appearances of colored materials is “Fukami” sensation (Similar but identical to depth sensation). Usually its sensation is recognized as a very important property for colored materials. But there is no scale for evaluating it.
In this paper, we examine the relationship between “Fukami” and the color attributes of colored materials.
First, we carried out a subjective evaluation by paired comparison with colored chips to examine the contribution of three attributes to “Fukami”, and to make the “Fukami” scale (Fukami). The test colors, in the experiment, were limited to low values and chromatic color areas where we presume that many people strongly sense “Fukami” in general.
We found that “Fukami” is related to the decrease in value and chroma, and also depends on the difference of hue.
Next, we formulated an equation for “Fukami” prediction of the object color based on this direction.
Fukami (1) cal=F
0+Asin {3.6 (ΔH
10RP-10
H0)}
This equation consists of two terms. F
0 gives the “Fukami” based on the position of the certain hue circle V/C Group, which has equal value and equal chroma. Asin {3.6 (ΔH
10RP-10
H0)} gives the amount of “Fukami” variation depending on hue in the V/C Group. F
0, A, Ho are the parameters calculated from the three attributes. Except for hue Y, this equation is accurate enough in the experiment color area.
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