Effect of gamut shape on colour preference

A psychophysical experiment was conducted to investigate the colour preference of various objects placed in viewing booth, arranged to mimic a typical restaurant setting, under pairs of light settings. Two sets of spectral power distributions (SPDs), with five SPDs in each, had similar relative-gamut indices of 121 and 111, respectively, but different gamut shapes, shape of the polygon created from the chromaticities of colour samples of the average chromaticities in each hue angle bin in a colour space. The systematic variation in gamut shapes created different colour shifts for different objects, leading to different preferences. The colour shifts of familiar objects created by these stimuli were especially important to judgments of overall colour preference. A supplementary colour vector graphic illustrating shifts in hue and chromacan convey additional importtant information about colour rendition, complementing colour fidelity and relative-gamut indices.