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Saturday, January 20, 2018

The following items have each been considered part of prepress at one time or another: typesetting, copyediting, markup, proofreading, page layout, screening (of continuous-tone images such as photographs), retouching, page assembly (stripping), imposition (combination of many pages into a single signature form), trapping (also referred to as spreading and choking), separation (specifying images or text to be put on plates applying individual printing mediums [inks, varnishes, etc.] to a common print) and platemaking (photomechanical exposure and processing of light-sensitive emulsion on a printing plate).

However, in most modern environments the tasks relating to content generation and refinement are carried out separately from other prepress tasks, and are commonly characterized as being part of a different process (i.e.: graphic design). Some companies combine the role of graphic design and prepress production in a role or job title known as desktop publisher or DTP associate.

The set of procedures used in any particular prepress environment is known as a workflow. Workflows vary, depending on the printing process (e.g., letterpress, offset, digital printing, screen printing), on the final product (books, newspapers, product packaging), and on the implementation of specific prepress technologies. For example, it is not uncommon to use a computer and imagesetter to generate film which is then stripped and used to expose the plate in a vacuum frame; this workflow is hybrid because separation and halftoning are carried out via digital processes while the exposure of the plate is carried out via an analog one.