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Discussion

Match each index with what it evaluates.
List I
A. Metamerism index
B. Colour inconstancy index
C. Whiteness index
D. Colour difference
List II
1. how white a nominally white sample appears
2. a pair of samples across two illuminants
3. a pair of samples under one illuminant
4. one sample across two illuminants

  • A.A-2, B-4, C-1, D-3
  • B.A-4, B-2, C-1, D-3
  • C.A-2, B-4, C-3, D-1
  • D.A-3, B-1, C-4, D-2

Answer: A

Each answers a different question about the same measured data. Selecting the right index depends on what is actually being asked. Each index answers a different question. Choosing correctly requires knowing the question.

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