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A special metamerism index for change of illuminant is calculated by

  • A.measuring only the colour difference under the reference illuminant
  • B.counting the number of crossovers in the two curves
  • C.asking an observer to judge the pair under two lights
  • D.correcting the pair to match under the reference and measuring the residual

Answer: D

The correction removes any residual mismatch that would inflate the index. What remains under the test illuminant is the metamerism proper. Residual mismatch would otherwise inflate the figure. The correction isolates the illuminant effect.

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