Illumination-based color enhancement

We propose a method to enhance color saturation while preserving the color appearance of white by controlling the spectral power distribution (SPD) of illumination. A color chart is used to design the SPD of illumination, which enables us to enhance several colors at the same time. In experiments, a sixteen-color LED lighting system was used as a light source. The intensity of each colored light can be modulated and is determined using the three color patches of the X-Rite ColorChecker. The color checker and multicolor wood-block prints were used to evaluate the color enhancement. The color distributions of these objects before and after changing the SPD of illumination were compared on a chromaticity diagram. Results show that the selected three colors are well enhanced with metameric white and the color balance under daylight preserved.

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