I've done very little work with images, but I remember section 8.2 (Graphics Objects) of the PDF spec was very helpful. Table 51 goes over different operators which are related to images. I think the thing you will find most helpful is the information on the "Do" operator; see table 87. It can apply to Images, Forms, and PostScript XObjects. You're probably hitting PS objects when you don't want to. Section 8.8.2 (PostScript XObjects) should be able to help you detect these.
For reference, I'm looking at the 1.7 spec (ISO32000), so my page numbers will match up to this version of the PDF spec. Remember, referencing the official PDF specifications and looking at the PDF file in a good text editor is often extremely helpful in debugging issues. Hope you find the above info helpful. ---- Thanks, Adam From: José Rodolfo Carrijo de Freitas <[email protected]> To: <[email protected]> Date: 10/22/2010 09:14 Subject: RES: copy entire stream of a page ignoring images Is there a fixed way which an image is created with tokens in a pdstream? After parsing some documents, I ended up gathering that When a stream starts with PDFOperator{q} ends with PDFOperator{Q} and has PDFOperator{Do} in the middle, it is an image. So I extract all those tokens to remove image from the page. So, in an stream for example, if I find this set of operators: PDFOperator{q}, COSInt{596}, COSInt{0}, COSInt{0}, COSInt{840}, COSInt{0}, COSInt{0}, PDFOperator{cm}, COSName{Im1}, PDFOperator{Do}, PDFOperator{Q} I'll cut them all to remove the image. But nothing is easy as it seems, so this measure is ruining some fonts of the page. Is there someone who understand this better and can give me a light on this problem? Atenciosamente, José Rodolfo Carrijo de Freitas Analista de Sistemas Softplan - Departamento de pesquisa e desenvolvimento Sistema da Qualidade Certificado ISO 9001:2008 (48) 3027 8000 Ramal 8359 http://www.softplan.com.br -----Mensagem original----- De: José Rodolfo Carrijo de Freitas [mailto:[email protected]] Enviada em: sexta-feira, 22 de outubro de 2010 09:39 Para: [email protected] Assunto: copy entire stream of a page ignoring images Hello, I’m trying to write a function to copy the stream of a page to another page. The thing is that it seems the PDFStreamParser is not parsing texts, cause I´m not getting any texts on my new page. And besides, I´m getting a warning when opening the newpages on adobe reader. Have someone made a similar function, or could give me a little help here? Ps: does someone known a pdf utility which could look at elements of a stream? private void copyPageWithoutImage(PDPage page, PDPage newpage) throws IOException { PDStream contents = page.getContents(); contents.getStream(); PDFStreamParser parser = new PDFStreamParser(contents.getStream()); try { List tokensNovos = new LinkedList(); Iterator<Object> iter = parser.getTokenIterator(); List arguments = new ArrayList(); while (iter.hasNext()) { boolean allowNext = true; Object next = iter.next(); Object aux2 = next; if (aux2 instanceof COSName) { COSName objectName2 = (COSName) aux2; System.out.println(objectName2.getName()); } if (next instanceof COSObject) { arguments.add(((COSObject) next).getObject()); } else if (next instanceof PDFOperator) { if (next instanceof PDFOperator) { PDFOperator op = (PDFOperator) next; String operation = op.getOperation(); if (operation.equals("Do")) { if (arguments.size() > 0) { Object aux = arguments.get(0); if (aux instanceof COSName) { COSName objectName = (COSName) aux; PDXObject xobject = (PDXObject) page.getResources().getXObjects().get(objectName.getName()); if (xobject instanceof PDXObjectImage) { allowNext = false; } } } } } arguments = new ArrayList(); } else { arguments.add(next); } if (allowNext) { tokensNovos.add(next); } } PDPageContentStream contentStream = new PDPageContentStream(this.pdf, newpage); contentStream.beginText(); contentStream.endText(); contentStream.close(); PDStream updatedStream = newpage.getContents(); ContentStreamWriter tokenWriter = new ContentStreamWriter(updatedStream.createOutputStream()); tokenWriter.writeTokens(tokensNovos); newpage.setContents(updatedStream); } finally { if (parser != null) { parser.close(); } } } 〉 Click here to submit conditions This email and any content within or attached hereto from Sun West Mortgage Company, Inc. is confidential and/or legally privileged. The information is intended only for the use of the individual or entity named on this email. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution or the taking of any action in reliance on the contents of this email information is strictly prohibited, and that the documents should be returned to this office immediately by email. Receipt by anyone other than the intended recipient is not a waiver of any privilege. Please do not include your social security number, account number, or any other personal or financial information in the content of the email. Should you have any questions, please call (800) 453 7884.
