My code looks like this BufferedImage pageimage = *new* PDFRenderer(pdfdocument).renderImageWithDPI( pagenum, outputres);
ImageIO.*write*(pageimage, "png", tmpfile); where outputres is 300.0f. The only difference on my side is that in one case I build with pdfbox-app-2.0.6.jar, the other with pdfbox-app-2.0.7.jar In both versions I get a full page image that is 2550 x 3300 pixels, with a bit depth of 24bits. However for this one page file I am looking at the 2.0.6 .png file is 1.53MB and the 2.0.7 file is 7.83MB If I read both .png files into Photoshop and zoom way in, they are indeed different. This is a screenshot of them side by side with 2.0.6 on the left and 2.0.7 on the right. [image: Inline image 1] Since gmail seemed to shrink the image when I pasted it in, I also included it as an attachment. If you look at the attachment closely you can see the photoshop pixel numbers on the left. It appears that 2.0.6 actually has a minimum resolution of 2 pixels, whereas 2.0.7 has a resolution of 1 pixel. But 2.0.7 seems slightly out of focus. So as I said before, I'm not sure which is better, but it's not a difference I would expect. Or would like to have some control over. Regards On Sun, Oct 1, 2017 at 10:19 AM, Tilman Hausherr <[email protected]> wrote: > Hi, > > No idea what you mean. I have a test with about 1000 PDF files that > renders at 96dpi and compares the result. If the images were bigger / > smaller then this would be noticed. > > Please explain what size you get from what PDF with what version and what > code. > > Tilman > > > Am 01.10.2017 um 18:55 schrieb Joel Hirsh: > >> I am using PDFRenderer.renderImageWithDPI and found that the generated >> images have changed substantially from 2.0.6 to 2.0.7. Images are 2x to >> 4x >> bigger in 2.07 than 2.0.6 and really impact OCR processing on those >> images. >> >> Its hard to say whether or how one is 'better' than the other, but I'd >> like >> to understand what is happening and maybe how to control this. I didn't >> see anything in the 2.0.7 release notes that seemed to indicate a >> difference. >> >> I have verified that I can go back and forth between 2.0.6 and 2.0.7 and >> get consistent results within each version. And everything else is the >> same. >> >> I am also using the following jars: >> levigo-jbig2-imageio-1.6.5.jar >> imageio-jpeg-3.2.1.jar >> imageio-metadata-3.2.1.jar >> imageio-core-3.2.1.jar >> common-image-3.2.1.jar >> jai-imageio-core-1.3.1.jar >> jai-imageio-jpeg2000-1.3.1_CODICE_1.jar >> >> Any light you can cast on this would be appreciated. >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
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