Abstract:The recommendation of the CIE has been followed as close as possible to evaluate the accuracy of five color gamut mapping algorithms (GMAs), two non-spatial and three spatial algorithms, by psychophysical experiments with 20 test images, 20 observers, a test done on paper and a second one on display. Even though the results do not show any overall "winner", one GMA is definitely not perceived as accurate. The importance of a high number of test images to obtain robust evaluation is underlined by the high variability of the results depending on the test images. Correlations between the percentage of out-of-gamut pixels, the number of distinguishable pairs of GMAs and the perceived difficulty to distinguish them have been found. The type of observers is also of importance. The experts, who prefer a spatial GMA, show a stronger consensus and look especially for a good rendering of details, whereas the non-experts hardly make a difference between the GMAs.
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