Spectral sensitivities of the red-green and yellow-blue opponent-color responses were determined under broad-band light adaptation for the light-adaptation levels of 5 to 5000 Td. With changing light-adaptation level, the spectral-sensitivity functions of the opponent-color systems change in shape, especially in the short-wavelength region of the spectrum. The light-adaptation effect on the red-green responses can be ascribed to the changes at the cone receptor level, whereas the light-adaptation effect on the yellow-blue responses can be ascribed to the changes at two sites, i.e., at the cone receptor site and at the opponent site.
For the evaluation of color design, a multiple linear system analogous to the human visual perceptual system was proposed. Using computer‐generated random color patterns, a psychological test was performed and its results were analyzed in terms of the Fourier transform of the color patterns. It was clearly concluded that the power spectrum obtained by the Fourier transform of the patterns had characteristic meanings at regions of very‐low, low, medium, and high spatial frequencies.
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