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A metamerism index of zero indicates that the pair

  • A.reflects identically to the other at every wavelength
  • B.cannot be distinguished by any observer under any condition
  • C.matches equally well under both the reference and the test
  • D.fails to match under either illuminant considered

Answer: C

Correct answer: matches equally well under both the reference and the test

The index measures how much the match degrades between the two illuminants, so zero means it degrades not at all - not that the samples are identical, and not that the match is good. A poor match under the reference that is equally poor under the test has an index of zero, which is why the index is never reported alone.

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