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The dichotomy between the logarithmic and power‐law models of lightness perception is revisited. Both laws (and no other) are permitted by the luminance scale‐invariance of the equality of lightness differences. The logarithmic law, which emerges out of integration of Weber's law for just‐noticeable differences (JNDs), is the only one of these that is compatible with the observed background‐lightness‐invariance...
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