Emitis Roshan

1 Introduction In the past, numerous experiments have been conducted to measure color-discrimination thresholds for different colors. Surface materials such as painted ceramic, fabric, printed samples, paint, and also CRT or LCD display colors were used in various experiments [1-7]. The experimental data show that the color-discrimination threshold varies as a function of the color involved. Many color spaces or color difference formulas have been developed to fit the experimental data [8-12].