Abstract
Halftone color printers can be mathematically modeled rather accurately using the Neugebauer equations or the Yule- Nielsen equations. However, the color separation which is the inverse of the printer model is not an easy task. For obtaining the printer driving parameters needed for a color the most appropriate methods comprises lookup tables, iterative inversion of the model, or an approximation. In order to avoid the memory requirement of a lookup table we investigate the suitability of the latter two approaches for the inversion of the Neugebauer and the Yule-Nielsen model in three and four color printing. The iterative approach is based on the Newton gradient scheme, the approximate approach consists of a refinement of the very simple method CMY equals 1 - RGB. We compare both the results to the optimally achievable results and demonstrate the only slightly inferior results.
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