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How can I split a PDF's pages down the middle?

I have a pdf file that was made into a booklet format. It is meant to print on A4 paper in landscape orientation; here are two pages in the pdf, which should correspond to four pages in the actual book.

 -------------------------------
|              |                |
|              |                |
|              |                |
|    (1)       |      (3)       |
|              |                |
|              |                |
|              |                |
 ------------------------------- 

 -------------------------------
|              |                |
|              |                |
|              |                |
|    (4)       |      (2)       |
|              |                |
|              |                |
|              |                |
 -------------------------------

The bracketed numbers correspond to the order of the individual pages.

I know that there are all sorts of commands (pdfbook, pdfnup, etc.) on linux (which was probably used to make this booklet in the first place). How do I 'unbook' it---that is, I'd like to make a pdf document from this where each individual page of the final product is an individual page of the pdf, ordered in the usual way.

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Is your example layout above verbatim the layout of your book? How would you even put that together? If it was a different layout I might have a solution, but I'm confused the way it is currently. –  skub Jan 20 '12 at 23:47
    
as mentioned here, use BRISS –  Tobias Kienzler Aug 13 '12 at 14:05
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marked as duplicate by Oliver Salzburg Aug 13 '12 at 14:09

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2 Answers

You should look at these answers:

They do not apply exactly and literally to your question. But if you study them, you'll very easily figure out how to modify the method described there in order to solve your own problem.

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PDF is generally considered a one-way format only. If the page flow is mangled it would probably be very hard to get meaningful results. Better try to find the original pre-press version of the original file that was used to make the PDF. Converting PDF can be done but in most cases it badly affects the end result. Calibre is a free tool that does PDF to HTML,RTF,EPUB,etc but results vary. The app that gave the best results for me was SolidPDFConverter but it is commercial.

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