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Simultaneous contrast describes the effect in which

  • A.two colours viewed one after another appear to merge
  • B.a colour appears to fade when viewed for a long period
  • C.two light sources of differing colour illuminate a single object
  • D.a colour appears to shift depending on the colour surrounding it

Answer: D

Correct answer: a colour appears to shift depending on the colour surrounding it

A grey patch on a red ground looks greenish and the same patch on a green ground looks reddish, the induced shift being towards the complement of the surround. It follows from opponent coding, and it is why a colour must always be judged against a neutral surround if the judgement is to mean anything.

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