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The principal shortcoming of Delta E ab is that

  • A.it requires an observer to make a full visual judgement beforehand
  • B.it is valid for tungsten illumination and nothing else
  • C.CIELAB is not uniform enough for equal distances to mean equal differences
  • D.it cannot be computed without spectral reflectance data

Answer: C

Tolerances that are correct in one region of the space prove wrong in another. Weighted formulae were developed specifically to correct this behaviour. Tolerance varies greatly across the space. One figure cannot serve everywhere at once.

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