Colour constancy

Colour constancy is the tendency for a surface or object to appear to have the same colour when the illumination varies. The phenomenon of colour constancy indicates that colour vision does not depend only on the wavelengths of the light reflected from objects. If that were the case, then the same object would, for example, appear redder in artificial light than in natural light. In fact, we generally show reasonable colour constancy in such circumstances. Zeki (1993, p. 12) argued forcefully that it is very important to understand colour constancy:

Why did colour constancy play such a subsidiary role in enquiries on colour vision? .until only very recently, it has been treated as a departure from the general rule, although it is in fact the central problem of colour vision. That general rule supposes that there is a precise and simple relationship

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