Discussion
Correction of the pair before computing a metamerism index is necessary because
Answer: B
Correct answer: any residual difference under the reference would inflate the index
The index is meant to measure how much the match degrades between illuminants, not how good it was to begin with. If the pair does not quite match under the reference, that residual is carried into the test illuminant calculation and counted as metamerism. Correcting the pair to agree under the reference isolates the degradation.
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