Hi, thanks for all the answers. As mkl said, I started this thread due to a problem between Adobe9 and iText. Adobe9 verifies the signature fields including the whole document, not just from revision to revision, whilst iText verifies signature fields from revision to revision.
If I sign a document, edit it and sign it again, iText validates these signatures, but Adobe9 indicates that the first signature is not valid. What I need to know is how to compare two revisions of a PDF without bearing in mind the signatures, whether they are visible or not. Leonard Rosenthol-3 wrote: > > PDF/A-1 fully supports annotations, links and form fields - so you can't > simply rely on simple visual either. > > Leonard > > -----Original Message----- > From: mkl [mailto:m...@wir-sind-cool.org] > Sent: Tuesday, May 26, 2009 5:12 PM > To: itext-questions@lists.sourceforge.net > Subject: Re: [iText-questions] How can compare the content of two revision > > > > Mike Marchywka-2 wrote: >> >>> As this thread originated in one about digital signatures, I doubt that >>> is >>> what he needs. >> >> In my first post, I mentioned the opposite extreme of rendering all pages >> to BMP and doing a simple pixel subtract- this can be quite useful in >> some >> cases. >> > > Yes, when just checking for visual identity, that would be a way to go. If > the document is PDF/A that should suffice. Otherwise there may also be > some > dynamic components, though, the behaviour of which is not captured like > this. > > Regards, Michael. > -- > View this message in context: > http://www.nabble.com/How-can-compare-the-content-of-two-revision-tp23649348p23731451.html > Sent from the iText - General mailing list archive at Nabble.com. > > > ------------------------------------------------------------------------------ > Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT > is a gathering of tech-side developers & brand creativity professionals. > Meet > the minds behind Google Creative Lab, Visual Complexity, Processing, & > iPhoneDevCamp as they present alongside digital heavyweights like > Barbarian > Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com > _______________________________________________ > iText-questions mailing list > iText-questions@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.1t3xt.com/docs/book.php > Check the site with examples before you ask questions: > http://www.1t3xt.info/examples/ > You can also search the keywords list: > http://1t3xt.info/tutorials/keywords/ > > ------------------------------------------------------------------------------ > Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT > is a gathering of tech-side developers & brand creativity professionals. > Meet > the minds behind Google Creative Lab, Visual Complexity, Processing, & > iPhoneDevCamp as they present alongside digital heavyweights like > Barbarian > Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com > _______________________________________________ > iText-questions mailing list > iText-questions@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.1t3xt.com/docs/book.php > Check the site with examples before you ask questions: > http://www.1t3xt.info/examples/ > You can also search the keywords list: > http://1t3xt.info/tutorials/keywords/ > > -- View this message in context: http://www.nabble.com/How-can-compare-the-content-of-two-revision-tp23649348p23776308.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
