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The l to c ratio in the CMC formula controls

  • A.the number of decimal places in the reported value
  • B.the relative weighting given to lightness against chroma
  • C.the total tolerance that is applied to the pass fail decision
  • D.the illuminant used in computing the difference

Answer: B

Correct answer: the relative weighting given to lightness against chroma

CMC is written CMC(l:c), and the ratio sets how much a lightness difference is discounted relative to a chroma difference. The textile convention is 2:1, which reflects the trade’s greater tolerance of a shade being slightly light or dark than of it being off in chroma; 1:1 is used for perceptibility work.

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