Choose your RIP settings according to what your pressmen say as well. Euclidian dot shape to begin with, as it yields a more controllable, predictable dot gain on press.Īlways bear in mind that good communication between the prepress and the offset guys is crucial, now that your role has changed: you no longer produce film but plates and you will be responsible for the plate quality now, including all plate/image geometry and marks, raster uniformity across plate, even wearing in longer runs if applicable. For instance, if your press conditions are pretty much standard and the offset machine is in good condition I would suggest 175 lpi for offset coated. Screening parameters like dot shape, frequency (lpi) and angles are dictated not only bypaper paper characteristics - ink absorbtion, but more important by the offset machine being used, press conditions and (less important) image composition in jobs.
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