PDF, PostScript and Imposition tools

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Introduction

First: you may not know what imposition is: Wikipedia will tell you.

A list of tools which are useful for imposition.

Two type of software are listed here:

• software which can be obtained free of charge and can help you do some imposition tasks.
• imposition software (free, free of charge or payware)

There is also another wiki page on just Imposition.

Multiplatform

• pdftk (free)
• bookbinder (free)
• multivalent (free) (see How to make impositions with Multivalent)

example for making a booklet:

$ java.exe -cp multivalent.jar" tool.pdf.Impose -dim 2x1 -layout 2,3,4,1
-paper "297x210 mm" -verbose file.pdf

• PoDoFo Impose (free; imposition tool distributed with the PoDoFo library)
• On-line imposition with PoDoFo (web based, work in progress; by Pierre Marchand; there is still an old server)
• Adobe Reader 8 and 9 will do booklet printing for you. For a A4 booklet, you just need to export an A5 document to PDF and then tell Adobe Reader to print it as a booklet. With Reader 9 you do not have to prepare a certain size as the Reader can scale (not sure if any precision issues). Depending on needs you may want the "Multiple Pages Per Sheet" or the "Booklet Printing" option in the Print Dialog "page scaling" option drop down.
• PDFSaM is a very reliable Java-based tool that provides many options to manipulate PDF files. Especially recommended for pre-press work!
• jPDF Tweak is a versatile Java-based tool with loads of options to edit PDF files.

Creating an imposition for an A5 folder (including 2-up printing and bleeds) with Scribus and jPDF Tweak requires :
(1) in Scribus :
- setting Units to "Pt" (because jPDF Tweak will need the correct numbers)
- selecting "double page" document layout
- setting "blend" for outer, top and bottom (NOT left) margin
- export to PDF 
(2) in jPDF Tweak :
- in "Page Size" set "Scale Pages", "Portrait" and Width/Hight manually
- in "Shuffle/N-up" set "Shuffle", "A4 Portrait" and "Booklet Portrait"
- RUN ;-)

• PDFedit is a collection of Qt3 scripts assembled under a GUI. It permits editing PDF files down to the level of text editing, font changes and more.
• pdfbook rearranges pages of a PDF file for booklet printing.

Linux, Unix and "Darwin"

• pstops (see How to make impositions with pstops)
• pdf-shuffler (introduction by bigbrovar) Not really an imposition program, but permits easy reshuffling and adding/deleting of pages.

OS X

• PDFmergeX (donationware): not really an imposition tool... but it may have enough features for you
• CombinePDFs (donationware)
• CocoaBooklet (donationware)
• PDFLab lets you split and join PDF documents as well as insert images and blank pages (donationware)