title: Ghostscript: convert pdf such that every page is a single image without individual objects/text
body: <p>I would like to convert a multipage pdf with images and text such that every page is just a flat image without individual objects/text that can be selected (needed to not mess up a pdf--&gt;ppt conversion...). It's not enough that the text can't be searched / copied (I've tried <code>-dNoOutputFonts</code>).
  This command does what I want for some of the pages that contain images, but not for others with  mostly text (it seems <code>-dHaveTransparency=false</code> is key here):</p>
  <pre><code>gs -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -dPDFSETTINGS=/printer -dCompatibilityLevel=1.5 -dHaveTransparency=false -dFastWebView=true -sOutputFile=out_file.pdf in_file.pdf
  </code></pre>
  <p>What is the magic setting here to get this behavior for all pages? (Ideally while retaining a high quality output and not blowing up the file size more than necessary ;-))</p>