Screening Techniques, moirein Four Color Printing

A survey is given of both rational and irrational tangent screening algorithms. Attention is given to the various ways to improve angular precision of rational tangent screens. A mathematical approach is presented to analyze moirein color reproduction. Both the second order moirefrom the interaction between cyan, magenta and black printers, and the moireintroduced by the yellow printer are explained. In addition, the interactions between the rasters and the recorder grid (recorder moire), and the rasters and the subject (subject moire) are discussed.