It is well known that brightness perception for object colors of the same hue increases with saturation. In this paper we investigate the effect of saturation on illuminant mode perception and brightness perception and compare those two perceptions using two methods: the paired comparison method and the matching method, on a CRT. We used the paired comparison method to investigate the effect of saturation on illuminant mode perception using stimuli of equal luminance and equal brightness perception. The results show that a higher saturation leads to a stronger illuminant mode perception for equal luminance stimuli. They also show that a highly saturated stimulus leads to a strong perception of illuminant mode for equal brightness stimuli, which means that the effect of saturation on illuminant mode perception is more than on brightness perception. The matching method shows that a lower saturation stimulus has higher luminance at equal illuminant mode and at equal brightness. The change of luminance in illuminant mode is greater than that in brightness.Results from the two methods correspond well; the perception of illuminant mode and brightness increases with increasing saturation, but the saturation effect on the perception of illuminant mode is stronger than on that of brightness.
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