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Scanning Prescreened Art

Rescreening—scanning images that have already been halftoned—is one of the toughest quandaries you'll encounter in Photoshop. We cover it in some detail in Chapter 15, Essential Image Techniques, but because you're scanning something that is essentially line art (there are no gray values in a printed halftone screen), it's worth a note here, as well.

One way to avoid the screen conflicts (moiré patterns) that you can get by scanning black-and-white halftoned images is to use the line art techniques described in this chapter. In other words, don't try to make Photoshop convert the halftone spots into gray levels; just leave them as halftone spots. This works best with images screened at 85 lpi or less, because you can pick up the detail you need to hold the screen.


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