Discussion
The minimum number of crossover points between the reflectance curves of a metameric pair is
Answer: A
Correct answer: three
For the two curves to give the same value on all three integrals, the areas under the difference curve weighted by each of the three observer functions must each vanish. A difference curve that changes sign only twice cannot make all three integrals zero simultaneously, so at least three crossovers are needed. Real metameric pairs usually show three or four.
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