Color-Order System Predicting Constant Hue

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Abstract
An Adjusted-hue color order system was devised by combining the hue and chroma functions of Moon and Spencer’s ω space, the Munsell value function, and the hue spacing recommended at Munsell 6/6 by the OSA Committee on Uniform Color Scales. Adjusted-hue coordinates are related to CIE tristimulus values by equations which are conveniently solved on a digital computer.The hue coordinate Ω-H of the Adjusted-hue system correlates well with Munsell hue for colors within the gamut of the original Munsell Book. In the Munsell-renotation extrapolation region, however, lines in CIE space of constant Ω-H and constant Munsell-renotation hue are significantly different functions of value and chroma. Experiments with high-chroma transparent specimens in an acrylic resin suggest that Ω-H is a better approximation to visually perceived hue than is Munsell-renotation hue in regions where the two disagree. As expected, adoption of the Committee hue spacing results leads to better correlation of visual estimates of hue difference with differences in Ω-H than with differences in Munsell-renotation hue. However, a still more drastic readjustment of the Munsell hue spacing might further improve the correlation.

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