Discussion
Assertion (A): A spectral match is not necessarily a closer match under the reference illuminant.
Reason (R): A metameric pair may match the reference more exactly while failing elsewhere.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A metameric recipe optimised against the reference illuminant can hit those tristimulus values very exactly indeed, while a spectral match limited by the available colourants may leave a small residual difference. The spectral match is nonetheless the better one, because its small difference stays small under every illuminant.
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