Thanks for the so many replies. Ben's idea is especially helpful. I've been following up on that in last few days. Looks like in the output method in PDFDocument.java, we can intercept each PDFObject before it is "printed" to pdf file, if it's a PDFStream object, we can decode the data string and do the replacement Ben suggested, and then put it back to PDFStream.
I hope I don't miss any piece. LZ --- Ben Galbraith <[EMAIL PROTECTED]> wrote: > iText can't do the manipulation in question, but > Multivalent > (sourceforge) might do the trick. Multivalent > didn't successfully > uncompress the objects in my largish 80 MB PDF, > however. > > I wound up home-growing my own utilities to > post-process the PDF as a > learning exercise. Took about a day. PDF is a > well-documented format > and uses well-documented widely-supported > compression algorithms. > > We actually use iText to create composite PDFs (two > or more PDFs placed > on top of each other) and our utility to add the > spot colors or convert > to CMYK programmatically. > > I wish I could share some of our code... working on > getting approval to > open-source some of it. > > Ben > > George Yi wrote: > > > I heard Jeremias mentioned Chamelon(Spell) Colour > can do the post process > > but I never tried. > > > > George > > > > -----Original Message----- > > From: Clay Leeds [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, October 07, 2003 11:59 AM > > To: [EMAIL PROTECTED] > > Subject: Re: CMKY > > > > > > Ben Galbraith wrote: > > > >>FOP does support CMYK JPEGs -- there's a previous > thread on this issue > >>that I participated in that should document it > fairly well. > >> > >>XSL-FO may provide support for CMYK through its > color space features; > >>haven't studied it enough to grok it, not sure. > >> > >>FOP doesn't not support CMYK for the elements it > renders. However, I've > >>found that post-processing the PDF is actually > fairly straight-forward > >>and enables introduction of both spot colors and > CMYK colors. This > >>process involves searching through each object in > the PDF and replacing > >>the RGB commands (PDF: rg/RG) with CMYK (PDF: k/K) > or color space (PDF: > >>cs/CS, scn/SCN) commands. It seemed scary at > first, but actually not > >>that bad. If anyone has interest in learning more > about this technique, > >>let me know. > >> > >>Ben > > > > > > I'm interested in this topic more because I'd like > to add this type of > > information to the FOP web site than for any other > reason (my company > > currently doesn't really care *that* much about > color--but I'm > > interested!). I assume you use some sort of > post-processor like iText or > > something? If you could create some sort of > tutorial or something on how > > to do this, I think it would be *very* useful. > Sounds intriguing! > > > > Web Maestro Clay > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: > [EMAIL PROTECTED] > > For additional commands, e-mail: > [EMAIL PROTECTED] > > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: > [EMAIL PROTECTED] > > For additional commands, e-mail: > [EMAIL PROTECTED] > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
