Color Discrimination of Twelve Observers*

The sensitivities of twelve normal observers to small color differences were determined by studying the distribution of color-matching errors about a color center. Twenty-two color centers were used. These were distributed throughout the chromaticity diagram. The average luminance of the colors was 4.9 ft-L. The matching field size subtended 10° at the observer’s position. The remainder of the visual field was filled with a white surround. The data for the twelve observers are found to be in general agreement with previous experiments although some differences appear significant.