Discussion
Consider the following statements about the Kubelka Munk function.
1. It is approximately additive across colourants in a mixture.
2. It is computed separately at each measured wavelength.
3. Reflectance itself is additive in the same way.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are the working assumptions of the method: \( K/S \) adds across the colourants in a mixture, and the calculation is carried out independently at each of the sixteen or thirty-one measured wavelengths. Statement 3 is exactly what is not true - reflectances do not add, which is why the transformation is needed at all.
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