You could use UFraw which has a plug-in for GIMP and then you just edit the image in GIMP.
 
http://ufraw.sourceforge.net/

From: "joe@actionline.com" <joe@actionline.com>
To: plug-discuss@lists.plug.phoenix.az.us
Sent: Tuesday, November 1, 2011 2:26 PM
Subject: How to convert cr2 (raw) image format to jpg?

What is the easiest, fastest, most efficient way to convert
a cr2 (raw) image format to jpg?



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