title: PDFBox - convert image to PDF, PDF resolution
body: <p>I am using PDFBox v2 to convert jpg images to PDF. JPG image is already on the filesystem, so I just pick it up and convert it to PDF. Below is my code</p>
  
  <pre><code>public void convertImgToPDF(String imagePath, String fileName, String destDir) throws IOException {
          PDDocument document = new PDDocument();
          InputStream in = new FileInputStream(imagePath);
          BufferedImage bimg = ImageIO.read(in);
          float width = bimg.getWidth();
          float height = bimg.getHeight();
          PDPage page = new PDPage(new PDRectangle(width, height));
          document.addPage(page);
          PDImageXObject img = PDImageXObject.createFromFile(imagePath, document);
          PDPageContentStream contentStream = new PDPageContentStream(document, page);
          contentStream.drawImage(img, 0, 0);
          contentStream.close();
          in.close();
          document.save(destDir + "/" + fileName + ".pdf");
          document.close();
      }
  </code></pre>
  
  <p>This code does the conversion just fine. However, I have observed the following in converted PDFs</p>
  
  <ol>
  <li>When I open a converted PDF, it opens very slowly (in Acrobat reader). It seems as it PDF is opening pixel by pixel. If I open any other PDF, it opens just fine.</li>
  <li>The default size in acrobat reader is shown to a smaller value (like 15% or 24%, screenshot attached) for converted PDFs. Even though it covers 100% of the screen (15% sould have implied that I see a much smaller image, but that is not the case). When I change the size to 100%, I see a highly blurred image which is much larger than the actual image and I have to scroll left/right and top/down to see the complete image.</li>
  </ol>
  
  <p>Both these observations make me feel that for some reason the PDF that is getting generated is a much higher resolution than it should have been. Would  that be a fair statement? If so, how can I correct this? </p>
  
  <p><a href="https://i.stack.imgur.com/THDHw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/THDHw.png" alt="PDF size"></a></p>
  
  <p><strong>EDIT</strong>
  Attached the JPG image which is being converted to PDF. When I open the PDF, it shows a size of 25.9%. This image was clicked on iPad.</p>
  
  <p><a href="https://i.stack.imgur.com/ScuJT.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ScuJT.jpg" alt="Image to be converted to PDF"></a></p>