The fundamental assumptions made in the revised Kubelka–Munk (KM) model of light propagation in scattering and absorptive media, recently proposed [J. Opt. Soc. Am. A 21, 1942 (2004); 22, 866 (2005) ], are critically reviewed and analyzed. The authors argue that the model, now questioned by Edström [J. Opt. Soc. Am. A 24, 548 (2007) ] is well founded on physical grounds and consistent with the original KM model, which has been the cornerstone of light propagation studies and utilized for more than half a century.
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