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Just for clarification NexPress is not the only VDX consumer. For me Optimized PDF means that for any recurring element only on COS object is created. Variable Formats such as VPS can be easily converted to Optimized PDF or VDX. Today the PDF2PS in Acrobat can export these COS objects (XObjects) as PSForms into the PS stream (albeit it takes a long time and it's not perfect), older versions of Acrobat sent multiple copies of the same object. For RIP performance I guess it will depend on how it uses XObjects, earlier Adobe RIP's behaved just like the early Acrobat versions. Golan Trevize > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:owner- > [EMAIL PROTECTED] On Behalf Of Cynthia Leslie > Sent: Thursday, April 08, 2004 3:06 PM > To: [EMAIL PROTECTED] > Subject: [PDFdev] PDF files optimized for RIPping > > The term "optimized PDF file" has been bandied about for a couple of years > in connection with printer/RIP performance. When people use this term in > the context that I am focusing on here, they are referring to a PDF file > that is constructed such that information that is common to all the pages > is stored only once and referenced as needed. These kinds of PDF files are > typically talked about in connection with variable-data- > printing/publishing applications, which usually output a PDF file that > contains a collection of documents that are similar but not identical. > > The idea is that if such a PDF file is sent to a printer/RIP that is > designed to take advantage of the optimization, documents will print at or > near rated print speed whereas they would print relatively slowly if the > PDF file was not optimized (i.e., if it contained a lot of redundant > information). > > One such optimizated PDF format is the PPML/VDX format, but I am NOT > talking about that format, because (as far as I know) the only PPML/VDX- > consuming device available today is the NexPress -- and I'm interested in > an optimized PDF format that is designed for many RIPS/printers -- > ideally, B&W devices and well as color devices. > > Note also that I am NOT talking about the linearized PDF format, which is > optimized for Web viewing and is documented in Adobe's PDF Reference. > > What I am talking about is some other PDF format or formats that are > generated by various software applications, typically variable-data- > printing/publishing applications. > > My first question is this: when people talk about an optimized PDF file in > this context, are they referring to a particular format that is documented > somewhere? I have not been able to find any standard or specification for > this. > > Also: I know that the kind of optimized PDF files that I'm talking about > will only print at or near rated print speed on certain printers/RIPS that > are designed to take advantage of such optimization. So my next question > is: what printers/RIP are designed to take advantage of this kind of PDF > optimization? Or, is it a matter of proprietary formats -- i.e., does an > application have to generate a particular type of optimized PDF format for > one printer/RIP, a different kind of optimized PDF format for another > printer/RIP, etc.? > > BTW, I realize, of course, that there are lots of non-PDF print-stream > formats that are designed to make certain printers/RIPS print as fast as > possible (e.g., VPS, VIPP, FreeForm, etc.) -- but we have reasons for > wanting to stick with a pure PDF workflow for a particular application > that we are working on. > > Any and all replies and comments are welcome! > > - Cynthia Leslie > > > > > To change your subscription: http://www.pdfzone.com/discussions/lists-pdfdev.html
