Ensuring your resolution/line screen produces 256 graysIn printing your file, you may find that the resolution of your printer, when combined with the chosen line screen, allows fewer than 256 levels of gray. A higher screen frequency decreases the levels of gray available to the printer. (For example, if you are printing at a resolution of 2400 dpi, using a line screen higher than 150 results in fewer than 256 levels of gray.) The following table lists the maximum line-screen setting you can use with printers to maintain all 256 levels of gray:
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