DESKTOP FRAMEWORKS CONCEPTS - Page composition

Page composition

Page composition is the process of composing pages for a folio using previously generated pages, adornments, and other page fragments. From the printing perspective, composition occurs after a complete folio has been generated. Composition does not generate new pages, it operates on completed pages.

Page compositors

Page compositors provide extensions to printing without affecting preexisting folios. A page compositor can be used to do any kind of preprocessing on a folio. You can use page compositors to perform tasks such as:

Printing forms or templates
Creating and placing labels automatically
Adding adornments to a page without modifying it
Making automatic production of 2-up, 4-up, or n-up compositions
Automatically arranging pages in imposition form
Converting pages into individual color separations and printing each separately

The main function of a page compositor is to create page iterators. These page iterators compose new pages out of old pages. Page compositors use the old pages as the basis for building the new page, which can contain information not included in the original pages.

The page iterators created by page compositors can be modified with page ranges, but they have no target folio. Instead, they use other page iterators as their target. You can use multiple page compositors to perform several preprocessing tasks on a single folio.

Printing services currently provide two types of page compositors:

TNUpCompositor creates variations of n-up printing--it places several target pages onto one destination page in a tiled format.
TPageImpositor is similar to TNUpCompositor. It composes several target pages onto a destination page, but it places the pages in an order and orientation that allows the printed sheet to be cut and folded so that the resulting booklet is already collated and ready for binding.

Composition and imposition

Automatic n-up composition prints n copies of a page image on a single sheet of paper. The sheet is cut to produce n finished pieces. Automatic imposition prints a multipage folio on a single, large sheet of paper. The printed sheet is folded and cut so that all
of the pages are in the proper order and orientation. Figure [ Illustration Missing ]
n-up composition

Figure
Imposition

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Composition and imposition
Automatic n-up composition prints n copies of a page image on a single sheet of paper. The sheet is cut to produce n finished pieces. Automatic imposition prints a multipage folio on a single, large sheet of paper. The printed sheet is folded and cut so that all of the pages are in the proper order and orientation.	Figure [ Illustration Missing ] n-up composition	Figure Imposition