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CIELAB requires the specification of a white point because

  • A.the coordinates are computed relative to a reference white
  • B.the illuminant does not otherwise affect the calculation at all
  • C.the observer must be told which white to look at
  • D.white is the only colour with defined coordinates

Answer: A

Tristimulus values are divided by those of the white before the transformation. Changing the white point changes every coordinate in the space. Normalisation by the white precedes the transform. Every coordinate depends on that choice.

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