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The Neugebauer equations are a set of equations used to model color printing systems, developed by Hans E. J. Neugebauer. They were intended to predict the color produced by a combination of halftones printed in cyan, magenta, and yellow inks.
The equations estimate the reflectance as a function of the reflectance of the 8 possible combinations of CMY inks , weighted by the area they take up on the paper. In wavelength form:
where Ri is the reflectance of ink combination i, and wi is the relative proportions of the 16 colors in a uniformly colored patch. The weights are dependent on the halftone pattern and possibly subject to various forms of dot gain.
Light can interact with the paper and ink in more complex ways. The Yule–Nielsen correction takes into account light entering through blank regions and re-emerging through ink: