The psychological representation, can people see the colors of nature, color can be visually express Munsell mark. Although intuitive translocation, but there is still a lack of quantitative perspective. But on the other hand, the XYZ color system, which is represented by the psychophysical method, can be used to represent the color correctly in terms of the number of three stimulus values or colors.
The distance between the color space and the psychological distance is not corresponding to the difference of color.
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