title: PDF with OCR text visible, how to hide it from existing PDF
body: <p>I have several PDF files that have been OCR-processed (not by me). They contain both the scanned image and the OCR text. They seem to work fine in some viewers (iPhone/iPad), but not in others (Preview.app on macOS) which makes them somewhat awkward to read.</p>
  
  <p>From googling around, it seems that the text &amp; image may be layered incorrectly or there is a problem with the fonts used? I'm not even sure I'm using the correct vocabulary, as most hits I get are worthless.</p>
  
  <p>Is it possible to use ghostscript or something to batch-fix these files?</p>
  
  <p>Example of "bad" rendering:
  <a href="https://i.stack.imgur.com/U0g5s.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U0g5s.png" alt="example"></a></p>