Kubelka–Munk theory

Common card · No. 495136

In optics, the Kubelka–Munk theory devised by Paul Kubelka and Franz Munk, is a fundamental approach to modelling the appearance of paint films. As published in 1931, the theory addresses "the question of how the color of a substrate is changed by the application of a coat of paint of specified composition and thickness, and especially the thickness of paint needed to obscure the substrate". The mathematical relationship involves just two paint-dependent constants. In their article, differential equations are developed using a two-stream approximation for light diffusing through a coating whose absorption and remission (back-scattering) coefficients are known. The total remission from a coating surface is the summation of: the reflectance of the coating surface; the remission from the interior of the coating; and the remission from the surface of the substrate. The intensity considered in the latter two parts is modified by the absorption of the coating material. The concept is based...

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