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Computational color prediction versus least-dissimilar matching.

The performance of color prediction methods CIECAM02, KSM2 , Waypoint, Best Linear, Metamer Mismatch Volume Center, and Relit color signal are compared in terms of how well they explain Logvinenko and Tokunaga's asymmetric color matching results [Seeing Perceiving24, 407 (2011)]. In their experiment, four observers were asked to determine (three repeats) for a given Munsell paper under a test illuminant which of 22 other Munsell papers was the least-dissimilar under a match illuminant. Their use of "least-dissimilar" as opposed to "matching" is an important aspect of their experiment. Their results raise several questions. Question 1: Are observers choosing the original Munsell paper under the match illuminant? If they are, then the average (over 12 matches) color signal (i.e., cone LMS or CIE XYZ) made under a given illuminant condition should correspond to that of the test paper's color signal under the match illuminant. Computation shows that the mean color signal of the matched papers is close to the color signal of the physically identical paper under the match illuminant. Question 2: Which color prediction method most closely predicts the observers' average least-dissimilar match? Question 3: Given the variability between observers, how do individual observers compare to the computational methods in predicting the average observer matches? A leave-one-observer-out comparison shows that individual observers, somewhat surprisingly, predict the average matches of the remaining observers better than any of the above color prediction methods.

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