InDesign’s job is to arrange text and graphics onto Pages; IDImposer’s job is to arrange those Pages onto printed Sheets.
For a folded and bound job, a Sheet typically contains at least 2 Pages on each side of a Sheet, for a total of 4 or more Pages per Sheet. See the Saddle layout above. More examples can be found here.
When the Pages of your booklet or other publication are ready to be arranged onto Sheets and printed, how should we do it?
A Prepress Printing Services Provider
We could bring our Pages to a prepress printing service provider. Certainly that is the right choice for many types of complex or high cost jobs. If you decide to take that approach, don’t forget to consult with your service provider as early as possible in the job production process.
A PDF Imposition System
Or we could export the reader-spread job to PDF, and then use one of the PDF-based imposition systems? That’s fine, if your budget and time allow, or if your job is already in PDF format. (But also see MultiPlace.jsx for building an InDesign document from a PDF file. It’s in the RESOURCES > HelperScripts folder, in the IDImposer folder.)
Acrobat’s Booklet Printing
How about Acrobat’s ‘Booklet Printing’ feature? It might suffice, if your needs are simple and you plan to print directly from Acrobat. But ‘Booklet Printing’ cannot write out an imposed PDF, and is limited to 2-up output.
InDesign’s Print Booklet
Okay then, how about using InDesign’s ‘Print Booklet’ feature?
On the plus side, Print Booklet is free.
On the minus side, Print Booklet is limited to simple 2-up layouts, on small sheets. And producing PDF files of imposed results is problematic. And there is no WYSIWYG preview of the imposed job before you print, resulting too often in wasted time and materials.
This website describes a different tool, called IDImposer. IDImposer works with Adobe InDesign to turn your InDesign ‘reader-page-order’ documents into 2-up or more-up ‘printer sheet’ documents, ready for cutting, folding, and binding.