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The Kubelka Munk function K over S is related to reflectance R by

  • A.R squared divided by one minus R
  • B.the logarithm of R taken directly
  • C.R multiplied by one minus R
  • D.one minus R squared, divided by twice R

Answer: D

Correct answer: one minus R squared, divided by twice R

\[ \frac{K}{S} = \frac{(1-R)^2}{2R}. \] The value of this transformation is that it is very nearly proportional to colourant concentration and additive across colourants, which reflectance itself is not. It is what makes the whole calculation tractable.

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