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The CIELAB space is described as approximately uniform, which means

  • A.the space has no relationship to perceived differences at all
  • B.the space is uniform only along the lightness axis
  • C.equal distances correspond only roughly to equal perceived differences
  • D.distances correspond exactly to the perceived differences everywhere

Answer: C

Correct answer: equal distances correspond only roughly to equal perceived differences

The qualifier is the substance of the claim. CIELAB was a great improvement on the xy diagram, whose ellipses vary by a factor of twenty, but the residual non-uniformity is still large enough to matter commercially - which is exactly why the weighted difference formulae exist.

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