Webster M A, Mollon J D
Department of Psychology, University of Nevada, Reno 89557.
Nature. 1995 Feb 23;373(6516):694-8. doi: 10.1038/373694a0.
Visual sensitivity is controlled by at least two distinct types of adaptation: light adaptation adjusts sensitivity to the mean luminance and colour in the stimulus, and contrast adaptation adjusts sensitivity to the variations in luminance and colour. Light adaptation is thought to be important in maintaining the perceived colour of objects despite changes in illumination ('colour constancy'), compensating for the mean changes in the light reflected from scenes under different illuminants. But for naturalistic colour signals, we show here that changes in an illuminant can also alter colour contrasts in images (how colours are distributed around the mean) enough to alter the state of contrast adaptation. Thus perceived colour under different illuminants may also be noticeably influenced by contrast adaptation.
明适应调节对刺激中平均亮度和颜色的敏感度，而对比度适应调节对亮度和颜色变化的敏感度。明适应被认为在维持物体的感知颜色方面很重要，尽管光照会发生变化（“颜色恒常性”），它能补偿不同光源下场景反射光的平均变化。但对于自然主义的颜色信号，我们在此表明，光源的变化也会改变图像中的颜色对比度（颜色围绕均值的分布方式），足以改变对比度适应状态。因此，不同光源下的感知颜色也可能受到对比度适应的显著影响。
