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Discussion

The CIE 1931 and 1964 observers give different CIELAB values because

  • A.the white point is defined only for the 1931 standard observer
  • B.CIELAB applies only to the 1964 observer
  • C.the tristimulus values differ before the transformation
  • D.the transformation itself differs between the two

Answer: C

The transformation is identical but its inputs are not. Reporting CIELAB values without naming the observer is therefore incomplete. The transform is identical but its inputs differ. Observer must accompany any quoted value.

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