Predicting hue scaling for abnormal color vision with perceptual models of color deficient vision

Abstract

The aim of this work was to test how perceptual models of color deficiencies predict the performance of dichromats and anomalous trichromats on a hue scaling paradigm. Stimuli presented on a monitor consisted of a square target of variable color displayed at the center of a D65 background. Both target and background had the same luminance of 12 cd/m 2. In order to scale the component sensations of the unique hues observers an arbitrary scoring rule assign a value of 3 when the stimulus is described with a single hue name and if two names were used a value of 2 to the predominant hue and 1 to the other hue. In the normal condition the colors of the target were selected in 24 directions around D65 illuminant with a hue-angle step of 15-deg. The simulation condition corresponds to Brettel’s and DeMarco’s transformation of the normal condition. The experiment was carried out by three normal color observers, four dichromats, and four anomalous trichromats. The results suggest that DeMarco transformation predicts anomalous trichromats perception better than Brettel’s model predicts dichromats perception.