The check for transparency can be done with a library like ImageMagick.
Here's a small sample that checks for any transparent pixel in png, jpg, svg 
and gif: 
http://bazaar.launchpad.net/~alecu/+junk/detect-transparency/view/head:/check-transp.py

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https://bugs.launchpad.net/bugs/1366266

Title:
  Images with transparency look wrong in the dash

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