Discussion
Arrange the steps of assessing a pair for metamerism in order.
1. compute the difference under each test illuminant
2. measure both samples spectrally
3. report the differences and the metamerism index
4. compute the colour difference under the reference
Answer: A
Correct answer: 2 - 4 - 1 - 3
Measurement comes first because everything after it is computation on the same spectral data. The colour difference under the reference establishes whether the pair matches at all; the differences under the test illuminants establish how that match holds up; and both are then reported together, since neither figure means much without the other.
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