Abstract
The psychophysical experimental methods were investigated to find an effective method for measuring color perception for low chroma color. Hue of the display stimuli was measured by two psychophysical experiments. One is the forced-choice experiment. The participants classified the hue of the stimulus as either yellow or blue and red or green. The proportion from the repeated responses was plotted on the chromaticity diagram with two hue axis. The angle from the positive x-axis to the point induced from the hue proportion represents the hue angle. The hue angle was converted to the 400-hue quadrature scale to express the hue as the percentage of two neighboring unique hues. The other experimental method is the magnitude estimation. The participants judged the hue of the stimulus as a number. As the result, the participants evaluated the color of the stimulus easily with the forced-choice method. In addition, the standard deviation between participants was small in the forced-choice experiment. It means that the forced-choice method is reliable. Therefore, this study expects to use the forced choice method to measure hue of low chroma color.
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