Just to finish my post...
Quite frankly, InDesign is not the place to do PDF imposition. It is not an imposition program and can be lossy for some detailed aspects of placed PDF (especially PDF/X output rendering intents and transparency flattening color spaces).
You're right... but sometimes InDesign is the best (or the less worst) last solution...: I often receive "dirty" PDFs made from office softwares (Publisher, Word, OpenOffice) either directly exported from these softs, or "distilled" by some crappy free PDF-izer (like PDFcreator) and I often have problem to impose these PDF in Acrobat 8:
- ImposerPro (ex ALAP, then Quark, and now stopped) often doesn't succeed to built the imposed PDF, returning an "Invalid operand: something missing" error
- and Quite Imposing, even being highly functional and highly reliable has often problems with such crappy PDFs...
... for example, on a serie of 5 PDFs, all exported from Publisher by the same client, ImposerPro returned an error and Quite Imposing made a strange conversion of the black from N=100 in the original PDF to CMJN black in the imposed PDF, with absolutely no way to retransform the CMJN black in N=100...
(althought the output preview of Acrobat and the preview of the RIP both showed a CMJN black, PitStop "affirmed" that it was a N=100 black and, of course, refused to convert it!!!)
... and in these cases the easiest way to finally cope with that kind of PDFs is to import all the pages in an InDesign template and image from InDesign.
(but there are two worst methods:
- import the PDF in an XPress template,
- or more worst, rasterize the PDF in Photoshop...
... and if you compare with objectivity, in fact, imposing PDF with InDesign is not such a bad method!!!)
Secondly, refrying PDF (the process of creating PDF from existing PDF) by printing to PostScript and distilling that PostScript back into PDF is strongly discouraged and not recommended by Adobe for a number of reasons, including loss of live transparency and color management issues.
Again, you're right... but refrying a PDF is also one of the solutions to image a recalcitrant PDF, being often THE last solution just before the rasterization in Photoshop...
... and again, compared to rasterization and shitty pixels-text printing, the simple loss of live transparency and color management issues are only little details making the refrying not such a bad solution!!!
(and the refrying is sometimes the only one method to image a crappy Publisher-PDFcreator PDF, or to image an exported PDF with a PostScript RIP)
*******
Dov, your advices are judicious in the pure theorie, but there is a big difference between the heaven of Adobe's theories, an heaven where everybody has the latest softwares, where all the printers have the latest RIP, where DTP is only made by skillful users with the appropriate Adobe's software, and where PDFs are always perfectly generated, only by experienced users and only with Adobe's recommanded methods...
... and the hell of the real life where only some people are able to afford for ALL the latest Adobe's new technologies and all the others have to cope with what they can buy, where "DTP" is done by anybody able to push the keys of a keyboard and move a mouse, with any software able to display pictures and write text on a screen, where softwares are full of bugs, and where
(because Adobe's has imposed the PDF as an exchange format to send jobs to the printers) today everybody is sure to have to do a PDF for the printer and so many people just click on anything-making-a-PDF wherever they can find it...
... and the real life is far, far, far away from Adobe's official recommanded methods, and that dealing daily with PDF is often a daily nightmare!!!
Come in my print-shop, I'll show you my "museum of horrors"
you'll be horrified to see the awful shit that people are able to make with your marvellous softwares!
(no irony in the word "marvellous": despite some painfull bugs, Adobe softs are really wonderfull tools for printing)