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Consider the following statements about metamerism indices.
1. A source index grades a simulator against its reference.
2. A sample index grades a pair of samples across illuminants.
3. The two indices measure exactly the same quantity.

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

Answer: B

The first two are correct and distinguish the two uses. The third confuses them, and each answers a quite different practical question. Confusing them misdirects the investigation. Each answers a different practical question.

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