We propose a method to enhance color saturation while keeping 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 three color patches of the X-Rite ColorChecker™. The color checker and multicolor wood-block prints were used to evaluate the results of 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 while keeping metameric white and the color balance under daylight.
M. Tsuchida, K. Hiramatsu, K. Kashino, "Designing Spectral Power Distribution of Illumination with Color Chart to Enhance Color Saturation" in Proc. IS&T 24th Color and Imaging Conf. , 2016, https://doi.org/10.2352/ISSN.2169-2629.2017.32.278