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Assertion (A): The correction step is essential before computing a metamerism index.
Reason (R): An imperfect match under the reference would otherwise be counted as metamerism.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the reason, and the two effects would be confounded. The correction isolates the illuminant dependence alone. Two effects would otherwise be confounded. Correction precedes the index calculation.

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