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Stripping (printing)
Stripping is a dying trade in which film negatives for printed pages are arranged to create printing plates. Negatives may be set up in a pattern to allow a printing press to print 4, 8, 16 or 32 pages at a time, front and back, which are then folded to produce a brochure or book with the correct pagination (see figure)or a variety of smaller printed products of various sizes may be arranged on a single larger press sheet to be cut down after printing into individual job components, such as business or post cards, folding boxes or hang tags.
==Color and density==
For color processes, an individual black and white, "screened" negative is used to represent each color in a four-colour process (Cyan, Magenta, Yellow and Black) to be printed on a printing press. A screened negative has varying sizes of dots arranged in a particular pattern to represented greater of lesser density of image. Typically, a 150 dots-per-inch screen is used to create each printing negative, though this will varying depending on the application, where a magazine may use 200 line screens and a newspaper may use 120 to 133 line screen. The screen is rotated at successively varied angles to ensure that the dots do not print exactly on top of one another.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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