There is evidence that the human visual system comprises three well-defined channels, with peak response at three widely different well-defined wavelengths. Illuminants concentrating their power at these three wavelengths yield pronounced visual clarity of the illuminated scene. In addition to these conclusions, this paper offers a superficial theory of visual clarity, and compares it to experimental results with different illuminants.
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Thornton et al. (1978) studied this question.
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