Relationship between mode‐boundary from surface color to fluorescent appearance and preferred gamut on wide‐gamut displays

Abstract

Abstract— Color‐gamut design is a major concern in wide‐gamut displays. To determine a preferred gamut for displaying object color in natural scenes on a wide‐gamut display, subjective evaluations were conducted to investigate the preferred color and acceptable limit. Then, simple synthesized images were used to determine the mode boundary between surface color and fluorescent color appearance. It was found that (1) observers perceived the colors with high saturation and high lightness as fluorescent colors and (2) the fluorescent appearance decreased preference. The color‐mode index (CMI) was defined as an evaluation index of the color‐appearance mode so that the boundary between surface color and fluorescent color appearance was defined as CMI 100. Additionally, it was found that the CMI 100 loci could be interpreted as an optimal color loci. Then, it was clarified that the mode boundary and the preferred gamut were closely related and that the acceptable limit for L* was 1.1 times L* for CMI 100.

An Approach for Reproducing Illuminant Colors and Specular Highlights on Television Using Color-Mode-Index (CMI)

“…Then, to clarify a relationship between CMI and preference, we conducted further experiments. In our previous research 13) , we revealed that the change in color-mode caused degrading of preference, that is to say, picture quality. However, we also noted that there were different dependencies on images, natural scenes, and artificial objects.…”

“…Kanai 12) indicated that there was the correlation between the preference of reproduced colors and the optimal colors which are the most vivid object colors. In our previous research 13) , we pointed out that wide-gamut was not always good in all cases and we felt unnatural because of the degrading of picture quality due to the change in color-mode in some cases. Casella 14) evaluated image quality of reproducing sRGB gamut This paper describes an approach for reproducing illuminant colors and specular highlights on television screens using Color-Mode-Index (CMI), which is a novel evaluation index for color-appearance of reproduced colors.…”

G₀ Revisited as Equally Bright Reference Boundary

“…In the movie industry, when colorists (over-)adjust the brightness/saturation of local objects, especially on a high-dynamicrange & wide-color-gamut display where brilliance is more relevant, the colors may appear fluorescent. Such warning boundary is approximately the G 0 gamut boundary [15,16].…”