Science of Media Information

Exhibition Program 15

Illumination-based color saturation control

Spectral operation using color enhancement factors


We introduced color enhancement factors to control the spectral power distribution of illumination, which enabled us to enhance one or several colors at once while maintaining the color appearance of white. In experiments, three color enhancement factors corresponding to red, green, and blue were calculated using color patches on a color chart and employed for controlling a sixteen-color LED lighting system. The color chart and old discolored wood-block printings were illuminated by the modulated light from the lighting system. Each color was continuously and independently enhanced by changing just three parameters while preserving metameric white and the color balance in daylight.


  • [1] 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 conference (CIC24), pp. 278-282, 2016.
    [2] M. Tsuchida , K. Hiramatsu, K. Kashino, “Color Enhancement by Optimizing the Illumination Spectrum,” NTT Technical Review, Vol. 16 No. 1, 2018,




Masaru Tsuchida
Masaru Tsuchida
Media Information Laboratory