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A metamerism index quantifies

  • A.the difference between two instruments measuring the same sample
  • B.the amount of short wave energy in the measuring beam
  • C.the observer variation between two assessors
  • D.the colour difference remaining when the illuminant is changed

Answer: D

The pair is first corrected to match exactly under the reference illuminant. Any residual difference under the test illuminant is the index. The reference match is established first. Residual difference under the test light follows.

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