I have read section 8.11.2 in the ISO 32000-1 and it says that there are 4 entries in optional content group and they are Type, Name, Intent and Usage. I see all these entries. Type and Name are fine. But Intent should be a name array and it is a PRIndirectReference. Usage should be a dictionary, but it is PRIndirectReference. Does anyone understand this?
------------------- Eli Segev -----Original Message----- From: Leonard Rosenthol [mailto:[email protected]] Sent: Thursday, July 15, 2010 9:42 AM To: Post all your questions about iText here Subject: Re: [iText-questions] Showing Invisible Layrers Have you read ISO 32000-1? You NEED to read the spec. Doing this w/o reading and understanding the spec is just trouble! -----Original Message----- From: Segev, Eli [mailto:[email protected]] Sent: Thursday, July 15, 2010 3:23 PM To: Post all your questions about iText here Subject: Re: [iText-questions] Showing Invisible Layrers Mark, Thanks. In the dictionary "OCProperties" I see a dictionary "OCGs" and in "OCGs" there is an array, which seems to have 6 dictionaries. There are 6 layers in the original PDF. I assume that the 6 dictionary items are related to the 6 llayers. Each dictionary item has two PRIndirectReference objects, a PdfString and a PdfName. The PdfName is 'OCG'. The PdfString holds the name of the layer. My question is how do I get from a PRIndirectReference object to a PDFOCG object? Can I see in the PRIndirectReference object that it is an invisible layer? Is the visibility information in the PdfName object? I don't see it. ------------------- Eli Segev -----Original Message----- From: Mark Storer [mailto:[email protected]] Sent: Wednesday, July 14, 2010 12:26 PM To: Post all your questions about iText here Subject: Re: [iText-questions] Showing Invisible Layrers First of all, let me introduce you to your new best friend, the Pdf Specification: http://www.adobe.com/devnet/acrobat/pdfs/PDF32000_2008.pdf It's an ISO spec, and you normally have to pay for it. However, Adobe hosts a publicly available copy that is fairly well buried on their web site. That's why I keep a copy of the URL handy for folks like yourself. You'll need to learn about the basic PDF object types (name, string, number, boolean, dictionary, array, stream, and indirect reference). It's all in chapter 7.3. Nothing terribly complicated. You don't need to know the exact syntax (which the spec goes into at length), iText takes care of that for you. It will be Very Useful however to know how to read it, because the spec has quite a few examples listed in that syntax. Then you'll need to know what a layer looks like. The PDF Spec calls them Optional Content Groups. As it turns out, optional content is stored at the document level. PdfDictionary root = myPdfReader.getCatalog(); "Root" and "catalog" are used interchangeably as the term for the top level object of a PDF, from which all other objects are referenced. The option content information is stored in the OCProperties key of the root dictionary: PdfDictionary ocProps = root.getAsDict(new PdfName("OCProperties")); According to 8.11.4.2, that dictionary will have two required keys, OCGs and D. OCGs is an array of optional content groups, and D is a dictionary specifying the default OC configuration. I'll leave the rest to you... but feel free to ask more questions if you get stuck. --Mark Storer Senior Software Engineer Cardiff.com import legalese.Disclaimer; Disclaimer<Cardiff> DisCard = null; > -----Original Message----- > From: Segev, Eli [mailto:[email protected]] > Sent: Wednesday, July 14, 2010 8:44 AM > To: Post all your questions about iText here > Subject: Re: [iText-questions] Showing Invisible Layrers > > > >The visibility of the layers is defined in the OC groups. This > structure is present in the root > >object of the PDF. > >So you need at least copy that structure to the root of the new PDF. > >(And maybe copy some more stuff, but that is a minimum requirement.) > > How do you copy the structure of the PDF? Do you use the PdfReader > object or the PdfImportedObject object? > How do you know that the file being read has invisible layers? > > ------------------- > Eli Segev > > -----Original Message----- > From: Segev, Eli [mailto:[email protected]] > Sent: Tuesday, July 13, 2010 4:38 PM > To: Post all your questions about iText here > Subject: [iText-questions] Showing Invisible Layrers > > I use the following code to add PDF images to a PDF page: > > import com.itextpdf.text.*; > import com.itextpdf.text.pdf.*; > > String file = ... > PdfReader reader = new PdfReader(file); > PdfImportedPage page = writer.getImportedPage(reader, > 1); > Image img = Image.getInstance(page); > > When I use a particular multi-layer PDF file, the invisible layers > become visible in the result image. Is there any trick to keep the > invisible layers invisible? > > ------------------- > Eli Segev > > ------------------------------------------------------------------------ > ------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > iText-questions mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.itextpdf.com/book/ > 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/ > > ------------------------------------------------------------------------ > ------ > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > iText-questions mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.itextpdf.com/book/ > 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/ > > ------------------------------------------------------------------------ -- > ---- > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > iText-questions mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/itext-questions > > Buy the iText book: http://www.itextpdf.com/book/ > 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/ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.830 / Virus Database: 271.1.1/3003 - Release Date: 07/13/10 > 11:36:00 ------------------------------------------------------------------------ ------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.itextpdf.com/book/ 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/ ------------------------------------------------------------------------ ------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.itextpdf.com/book/ 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/ ------------------------------------------------------------------------ ------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.itextpdf.com/book/ 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/ ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.itextpdf.com/book/ 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/
