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The subscript ab in the notation Delta E ab indicates that the difference is computed

  • A.in the CIELAB space using its a and b coordinates
  • B.using only the a coordinate and ignoring the b
  • C.under illuminant A with the b observer functions
  • D.by averaging two separate difference calculations

Answer: A

Correct answer: in the CIELAB space using its a and b coordinates

The subscript names the space, distinguishing the CIELAB difference from the CIELUV one written with the subscript uv. Both were published in 1976 and both are Euclidean distances, but in different spaces, so the same pair gives different numbers and the subscript is not decoration.

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