GNOME Bugzilla – Bug 699358
look at filename extension to determine format
Last modified: 2013-04-30 22:59:06 UTC
I've seen a request to save screenshots in jpeg, because that yields smaller files. While I think it would be inappropriate to use the lossy jpeg format by default, it might be nice touch to look at the filename and save a jpeg if it ends in .jpg or .jpeg.
Actually this was implemented in bug 521751 which fell through the cracks...there's a patch there that should work and is still marked as a-c-n. *** This bug has been marked as a duplicate of bug 521751 ***
Sweet !