![]() ![]() The appearance can vary, the pattern can be large or small, spots or checkerboard or crosshatching, very dominant or fairly mild. ![]() Such screened prints are simply poor for use as a master copy of an image. This "Before image" was scanned from a Micron advertisement in PC Magazine, and it shows the problem scanning any photograph in any printed material on any scanner. Only if you scan at a higher resolution than the printing screen will it not occur - you will simply see the printing dots in the scan. Any scanner will do this, it's simply a fact of physics. Moiré patterns are caused by interference between two sets of fine pattern grids, in this case, the scanner cells and the halftone screen in the original. You will discover a fine herringbone or crosshatched pattern (shown below) in the light areas of your scanned images from printed material. Scanning images from printed material has a very special problem ( copyright is a serious consideration too). Moire patterns from scanning printed material ![]()
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