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Recently, wide-gamut-display technologies have been developed such as RGBY four-primary color LCDs1), RGBYC five-primary color LCDs2), and RGB LCDs with highly saturated primaries. Distribution of real world object colors such as Pointer's data3) and SOCS4) 5) is taken into the consideration for designing the color primaries for UHDTV system6). On the other hand, in real-world scenes, there are not only surface colors such as flower, grass and skin tone, but also non-surface colors such as specular reflection from the sea, light sources, the sunshine and the sunset. Heckaman7) reported that the luminance range in those natural scenes was from 10–2 to 105 cd/m2 and over. But it is not practical to reproduce the luminance level of 105 cd/m2 on display. For TV-imaging, we should target that we would get the same "impression" as that when seen directly. This paper reports an approach for reproducing colors beyond surface colors on television using CMI, which is a novel evaluation index based on the color-mode of reproduced colors. We show the preferred CMI value for reproducing surface colors and illuminant colors through subjective evaluations. Then we show the application to reproduce non-surface colors with realistic impression by controlling color-mode using CMI.

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