Opponent-Process Solutions for Uniform Munsell Spacing

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Abstract
An iterative method is used to transform the chromaticity coordinates of the Munsell samples into another coordinate system such that the transformed values are spaced in accordance with the perceptual spacing of the colors. Acceptable transformations are restricted to those having an opponent-process form; brightness information is assumed to be conveyed by an independent channel. Under these conditions, the optimal transformation based on two chromatic processes is similar to one stage of the Müller–Judd formulation. By changing the constraints imposed on acceptable transformations, however, support can also be found for the Hering model. Therefore, even though many quantitative transformations can already be excluded, more data are needed before this method can be applied as a decisive test for models of color vision.

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