I do not have access to a spectrophotometer to measure paint reflectances. Where can I obtain the reflectance data for determining the Kubelka-Munk coefficients?
This is a difficult question. If you are interested in just working with the Kubelka-Munk theory in general then you can essentially make up reflectance values to use in your code. Another alternative would be to search the internet for reflectance databases. For example, our website www.cis.rit.edu/mcsl/online/cie.php has spectral reflectances for the Macbeth Color Checker. Unfortunately those sources won’t give you information about colorants at various concentrations that you would need to rigorously test a Kubelka-Munk implementation. If you are interested in a specific system (like a brand of paints), you might try making a request to the manufacturer for some nominal spectral reflectance data. Another alternative is to look for specification sheets from colorant manufacturers, who sometimes include reflectance data. Unfortunately, the only way to truly build and test a colorant formulation system is to have ready access to a spectrophotometer of your own. You might also refer to
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