Understanding reflection is one of the key competences in graphic arts industry. A very popular approach was given by KUBELKA-MUNK [1] who derived a simple relationship between the scattering and absorption coefficients and the overall reflectance. In the course of time, the theory was extended by several authors, see [2], [3] for recent improvements. This paper presents an alternative approach which describes the behavior of light in matter as a random walk. In this respect KUBELKA-MUNK is closely correlated to both well-known stochastic theories and recent combinatorial research, in particular with catalan numbers.
Klaus Simon, "A Stochastic Interpretation of Kubelka-Munk" in Proc. IS&T CGIV 2002 First European Conf. on Colour in Graphics, Imaging, and Vision, 2002, pp 468 - 472, https://doi.org/10.2352/CGIV.2002.1.1.art00099