title: Using ImageMagick/ZBar to read QR codes
body: <p>I've got scanned image files that I perform some preprocessing on and get them looking something like this:</p>
  
  <p><img src="https://i.stack.imgur.com/Fdnm1.png" alt="QR Code Image"></p>
  
  <p>My phone's ZBar app can read this QR code fine, but <code>zbarimg</code> seems to be unable to figure it out. I've tried all sorts of things in ImageMagick to make it smoother (<code>-smooth</code>, <code>-morphology</code>) but even with slightly better-looking results, <code>zbarimg</code> still comes up blank.</p>
  
  <p>Why would my phone's ZBar be so much better than my computer's (<code>zbar-0.10</code>)? Is there anything I can do to get <code>zbarimg</code> to read this successfully?</p>