Abstract
Abstract This chapter addresses the question of how colour constancy judgments vary under daylight changes. An experiment was performed to estimate the distributional properties of colour-constancy. An operational approach was adopted in which observers were required to distinguish illuminant changes on a scene from changes in the reflecting properties of the surfaces comprising it. The distribution of responses was anisotropic: observers were less able to detect spectral reflectance changes in one direction than in another. The long axis of the distribution is close to the tritanopic confusion line, although biased towards the daylight locus.
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