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Parametric factors in a colour difference formula allow for

  • A.which colourants happen to have been used in each sample
  • B.the age of the observer making the judgement
  • C.the cost of correcting the difference in production
  • D.differences between the actual and the reference viewing conditions

Answer: D

The formulae were fitted under defined conditions of illumination and presentation. Departures such as a separated pair or a textured sample are handled by these factors. The fitting assumed particular viewing conditions.

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