Low quality image rendering in gthumb/eog
This is bug 665897 in Gnome.
https://bugzilla.gnome.org/show_bug.cgi?id=665897
I faced the same problem and I looked for an alternative. I installed an app called Mirage from the repos and set it as the default image viewer. Mirage offers two big advantadges over the default image viewer:
- Image scaling is properly done.
- It preloads the next image so viewing a set of images is much more pleasant without having to way on sec. every time you click "next image".
IMHO the way the default image viewer scales the images is a bug (and should be corrected in following updates). The second is a feature (a trick if you want) that should be implemented in the default image viewer because it's one of those things that make people say "this is way faster in Windows".
Open gThumb and go to Edit > Preferences and make sure that Smooth images is checked.
