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Visual clarity" of lighting environment is affected significantly by changing the color-rendering property of its illumination . As the results of our previous studies for this phenomenon, it has already been confirmed that "visual clarity" of illumination is closely related to the affection of contrast on object colors under the illumination. Now, in order to establish a method for assessing "visual clarity" based on the affection of contrast, a comparison was made between the subjective estimations on affection of contrast and its predictions on various light sources. The results are as follows. 1) The change in affection of contrast by changing the color-rendering property of light sources can be estimated effectively by using a four-color combination composed of red, yellow, green, blue with high saturation. 2) The illuminance of equal affection of contrast is predicted by using the gamut area made by the component colors of the four-color combination in the color-appearance space on brightness and colorfulness. 3) The "equal gamut-area illuminance" of each light source well correlates to the "equal visual-clarity illuminance". Concequently, the change in "visual clarity" of lighting environment by changing the color-rendering property of its illumination can be estimated appropriately based on the affection of contrast using the gamut area of the four-color combination in the color appearance space on brightness and colorfulness.

Estimation of Visual Clarity Based on Affection of Contrast of the Four-Color Combination under Various Light Sources