title: insert transparent image to pdf using pdfbox
body: <p>I load my image to the pdf in the following way:</p>
  
  <pre><code>PDImageXObject image= PDImageXObject.createFromFile(&lt;image_path&gt;, doc);
  contentStream.drawImage(image, 15, pdfData.getPageHeight() - 80,
  image.getWidth(), image.getHeight());
  </code></pre>
  
  <p>I'm trying to make the image look transparent, like it would look in a header of a document(google docs, word etc.)
  is there an easy way to do this?</p>