Perception of hue re-examined: an analytical consideration of color-oddity test results

The purpose of this study is to investigate an earlier finding wherein more than 100 subjects in four age groups responded systematically but differently to Munsell hues. According to the theoretical construction of the Munsell Color System, the spacing of the 10 hues is in perceptually equal intervals; the error responses to all hues at constant chroma should therefore be equal. The mean error rates were compared with Munsell hue distribution on seven linear and non-linear transformations of the International Commission on Illumination chromaticity diagram to uniform chromaticity systems. Hue intervals are not equal: red and green have the smallest intervals and largest error, and yellow and yellow-red the largest intervals and smallest error rate. These observations were substantiated by results from multidimensional scaling experiments reported elsewhere.