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A-190 Basics of Imposition
ES3640e MFP EFI Job Management Guide - 190
DocBuilder Pro reorders imposed pages automatically according to
your choice of binding method, which can save a significant
amount of time and effort. Consider, for example, what must be
done when a book that was to be saddle stitched exceeds the
bindery’s maximum page count and must be reimposed as a
perfect-bound book. To redo the imposition by traditional means
would be labor- labour-intensive; with DocBuilder Pro, it takes
only moments.
Shingling and creep
All books and brochures use a sheet that is folded to create
separate page areas. Because the sheet itself has some thickness,
each fold causes a very small incremental shift in the location of
the edge of each page relative to the others. The result is that the
edges of pages furthest from the saddle’s innermost fold seem to
move away from the edges of pages closest to the innermost fold.
As the number of pages in the saddle increases, so does the
amount of this shift, which is known as shingling. To counteract
the effects of shingling (illustrated in an exaggerated manner in
the following figure), the bindery trims the edges of the finished
book to a common edge.
Trimming the bound pages resolves only half of the problem,
however—as the edges of pages move, so do the content areas
imaged on them. The apparent shift of content area caused by
folding a sheet multiple times is known as creep or binder’s creep.
The effect of creep is that the content area of pages closer to the
innermost fold in a saddle appear to move towards the outer
margins of the page.
Shingli
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