The only way to determine actual resolution is to parse the content stream.
Leonard From: Naz B [mailto:[email protected]] Sent: Wednesday, August 18, 2010 5:30 PM To: [email protected] Subject: [iText-questions] Attempting to read the DPI of images in a PDF Hello, I have browsed the archives and am still stumped. I am trying to verify that the DPI of images in a PDF are within a certain range. I have no control or knowledge of how the PDF was created. I found and ran the following code snippet: PdfReader chartReader = new PdfReader(fileName); int size = chartReader.getXrefSize(); for (int i = 0; i < chartReader.getXrefSize(); i++) { PdfObject pdfobj = chartReader.getPdfObject( i ); if (pdfobj != null && pdfobj.isStream()) { PdfStream stream = (PdfStream) pdfobj; PdfObject pdfsubtype = stream.get(PdfName.SUBTYPE); //System.out.println("Stream subType: " + pdfsubtype); if (pdfsubtype != null && pdfsubtype.toString().equals(PdfName.IMAGE.toString())) { byte[] image = PdfReader.getStreamBytesRaw((PRStream) stream); String filter=stream.get(PdfName.FILTER).toString(); int width = Integer.parseInt((stream.get(PdfName.WIDTH)).toString()); int height = Integer.parseInt((stream.get(PdfName.HEIGHT)).toString()); int bpc = Integer.parseInt((stream.get(PdfName.BITSPERCOMPONENT)).toString()); System.out.println("Height" + height); System.out.println("Width" + width); Image imageObject = Image.getInstance(image); System.out.println("ResolutionX: " + imageObject.getDpiX()); System.out.println("ResolutionY: " + imageObject.getDpiX()); } } } The height and width (in pixels) are reported accurately (verified via checking the images in the pdf in Acrobat Professional). However, the dpiX and dpiY are always 0 (they shouldn't be as per Acrobat Professional. ). Any ideas as to why this is the case? Thank you.
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