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Observer metamerism refers to the situation where

  • A.a sample changes colour over the course of a day
  • B.a pair matches for one observer but not for another
  • C.a pair matches under one illuminant but not another
  • D.an instrument and an observer disagree about a match

Answer: B

Correct answer: a pair matches for one observer but not for another

Observer metamerism is the observer analogue of illuminant metamerism: the samples differ spectrally, and two people whose colour matching functions differ slightly integrate that difference differently. It is why a match agreed by one colourist can be rejected by a colleague with entirely normal colour vision.

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