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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