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This research work was carried out to test color difference formulae by method of adjustment. 6 different color centers (Red, Yellow, Green, Blue-Green, Blue and Violet) were chosen for this psychophysical experiment. 336 virtual sample pairs were prepared. The mean color difference was DECIELAB three units. Each pair was assessed by a panel of 5 observers using psychophysical methods called Method of Adjustment. These visual data were used to test color-difference formulae: CMC, CIE94, DIN99d and CIE2000 together with basic CIELAB, with the help of simple statistical measures to fit i.e., PF/3, Stress and Wrong Decision Criteria. In the second step, the Lightness parametric factor kL was optimized for CMC, CIE94, DIN99d and CIE2000 with kC=kH=1. It was found that the visual results obtained from psychophysical method of adjustment showed that CIE94 being as a simplest linear transformation of CIELAB as well as DIN99d being as a logarithmic transformation perform very well for small color differences for both, original form and optimized form.

EVALUATION OF COLOR-DIFFERENCE FORMULAE USING CRT COLORS