Analyzing the natural color system's color‐order system by using a nonlinear color‐appearance model

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Abstract
The Natural Color System (NCS) is analyzed by using a nonlinear color‐appearance model. Perceptual uniformity was examined for each of the NCS attributes of blackness (s), chromaticness (Cr), and hue. Some nonuniformities were found in chromaticness and hue spacing, which were probably the result of the assessing and scaling method used in developing the system. In addition, a colorimetric interpretation is given to a principal plane in the NCS consisting of the colors with (s,Cr) = (50,0) and (0,100). The colors with (0,100) have different values of Y for different hues. Based on the analysis, a method is developed to predict the NCS attributes from the values x, y, Y of an object color by using the nonlinear color‐appearance model. The present analysis clarifies the importance of the NCS system in studying the color appearance of object colors.