stefanfoulis/django-filer — pull request #280 by samastur (2013-01-03 00:14:27+00:00)
Title: respect THUMBNAIL_PRESERVE_EXTENSIONS

Easy Thumbnails' THUMBNAIL_PRESERVE_EXTENSIONS option was being ignored.

This is basically the same implementation as it is in Easy Thumbnails and avoids odd behavior where setting this option doesn't seem to produce a desired behavior.

Ability to keep same format helps avoiding blemishes when resizing things like corporate logos.