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for a printing press
__ A simple formula for the size an image must be
scanned to be used for a given size printed image, is double the line screen of the
__ This is simple to calculate with a gray scale image. If the line screen of the printing plate is 150, you scan at 300 dpi. 150 line screen is becoming very popular because it corresponds to the dpi resolutions of computer printers.
__ When you are printing in CMYK (four color process printing) you calculate on the basis of one of its four plates, so again a 150 line screen is optimal at 300 dpi.
__ Many scanner drivers now do all the calculating for you automatically. You just put in the size that the image will be on the printed page and the resolution of the printer, and the driver delivers the exact file size you need.
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