yostudios/Spritemapper — pull request #26 by mccutchen (2012-06-06 18:56:45+00:00)
Title: Skip unsupported image formats

1. Skip attempting to parse images with non-png extensions

2. Gracefully handle errors from parsing invalid png images

I could not figure out how to attach this pull request to the existing issue #10, so I'm basically duplicating it here. Sorry for the noise!