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The theoretical basis of most colour matching software is

  • A.Grassmann's laws of additive colour mixing
  • B.nothing beyond the CIE colour-matching functions
  • C.Kubelka Munk theory relating reflectance to absorption and scattering
  • D.Beer's law relating the absorbance directly to the concentration

Answer: C

The K over S function is approximately additive across colourants. That linearity is what makes the inversion tractable at all. Reflectance itself would not behave so simply. The transformation is essential to the method.

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