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A pair described as metameric without further qualification is normally understood to be

  • A.a spectral match under every possible condition
  • B.metameric with respect to a change of illuminant
  • C.metameric with respect to a change of observer
  • D.metameric with respect to the viewing geometry

Answer: B

Correct answer: metameric with respect to a change of illuminant

Metamerism can be with respect to the illuminant, the observer, the field size or the geometry, but the unqualified word conventionally means the first. It is the kind encountered daily, and it is the kind the special index of metamerism was defined to quantify. Where another kind is meant, it is named.

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