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The reference conditions for CIEDE2000 include

  • A.a specified illuminant, background and sample separation
  • B.no conditions whatever, since the formula is entirely universal
  • C.only the illuminant and nothing further
  • D.which particular colourants were used in it

Answer: A

Correct answer: a specified illuminant, background and sample separation

The formula was fitted to visual data gathered under stated conditions: D65, a mid grey background, about a thousand lux, samples touching and subtending more than four degrees, with no visible texture. Departing from them does not invalidate the formula but does mean the parametric factors should be considered.

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