Evaluation for Display Color Reproduction Ability Using Number of Distinguishable Colors

Abstract

In this research, we proposed new evaluation method for display color reproduction ability. It considers the numbers of distinguishable colors based on luminance and chromatic Just Noticeable Difference(JND). When unit cell for distinguishable colors was defined, we verified luminance and chromaticity JND using the latest TV sets. Then we clarified that the numbers of distinguishable colors was influenced by contrast ratio, maximum luminance and color gamut. The number of distinguishable colors of the display designed contrast ratio 3000 : 1, maximum luminance 450cd/m², BT. 709 color gamut were 65000 colors at 40cd/m² and 32.71 million colors in total. And it was possible to evaluate display color reproduction ability our proposal method using distinguishable colors. Finally, we evaluated the influence of gamma and bit depth using our proposal method. Then we clarified that the display which designed gamma 2.2, 3000 : 1, 450cd/m², BT. 709 color gamut were needed 12bit for color reproduction in visually high density.