Multidimensional scaling of selected samples from the optical society of America uniform color scales

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Abstract
The Optical Society of America Uniform Color Scales was produced as an attempt to create a color order system in which equal geometric distances correspond to equally perceived color differences. A psychophysical experiment was designed to determine the perceived visual uniformity within two oblique planar subsets of the Uniform Color Scales. A modified interval‐scaling procedure using perceived value differences within a portion of the Munsell Value scale was used to assess the perceived magnitudes of dissimilarities between sample pairs of the Uniform Color Scales. Multidimensional‐scaling methods were used to analyze the dissimilarity data for the two planar subsets, each of which was judged by five observers. Despite some limited subadditivity for which a number of plausible explanations were provided, each oblique planar subset was shown to demonstrate satisfactory visual uniformity on the basis of the average judgement obtained for five observers. These results also demonstrate that it is possible for human observers to judge dissimilarities within a planar array varying in three attributes of color and to resolve those differences into a true two‐dimensional representation.

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