The perceived whiteness of 12 whitish samples with different spectral reflectance distributions (SRDs) was investigated using psychological experiments under two types of illuminants: incandescent lamps and D65 simulated ones. The illuminance level was kept constant at 1000lx. The scale value of the perceived whiteness was determined visually by paired comparison. An index developed in a previous study J. Illum. Inst. Jpn. Vol.83 No.11 (1999) was found to accurately estimate the perceived whiteness under various illuminants. The index is proportional to the ratio between the chromatic and achromatic responses in the visual system. In the present study, the index was modified to estimate the perceived whiteness of whitish samples with various SRDs. The modified index correlated highly with the experimental results. It can thus be used to estimate the perceived whiteness of whitish samples with various SRDs under different illuminants.
展开▼
