Abstract
SINCE the work of G. T. Fechner (1859) the functional relationship between the physical luminance (input) and the perceived brightness (output) in the visual system has been taken to be logarithmic. This hypothesis seems to have been based primarily on the observed constancy of the ratio of the just-noticeable stimulus change to its absolute value, known as Weber's law. In fact, however, this constancy is observed only at the higher luminances and even there it has been difficult to justify the assumed logarithmic gain on grounds other than expediency.
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LEVI, L. Automatic Gain Control Model for Vision. Nature 223, 396–397 (1969). https://doi.org/10.1038/223396b0
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DOI: https://doi.org/10.1038/223396b0
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