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The colour inconstancy index differs from the metamerism index in that it concerns

  • A.two separate instruments measuring the same sample
  • B.two observers judging the same sample
  • C.a single sample viewed under two illuminants
  • D.a pair of samples under one illuminant

Answer: C

It measures how much a single colour shifts when the light changes. A pair may be metameric while each of its members is also colour inconstant. One concerns a pair and the other a single sample. Both involve a change of illumination.

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