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Consider the following statements about inconstancy and metamerism.
1. Inconstancy concerns one sample under two illuminants.
2. Metamerism concerns two samples under two illuminants.
3. A metameric pair is necessarily colour inconstant.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

The first two are correct and distinguish the two properties. The third does not follow, since a pair may separate while each member stays reasonably constant. The two properties are separate. Neither implies the other in any way.

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