Purkinje phenomenon

reduction in the brightness of a predominantly long-wavelength colour stimulus relative to that of a predominantly short-wavelength colour stimulus when the luminances are reduced in the same proportion from photopic to mesopic or scotopic levels without changing the respective relative spectral distributions of the stimuli involved

NOTE In passing from photopic to mesopic or scotopic vision, the spectral luminous efficiencies change, the wavelength of maximum efficiency being displaced towards the shorter wavelengths.

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