For Linux users (and probably Mac, and other *nix systems), one of the best programs for quick and easy photo manipulation is the
shareware xv program. It is distributed as a C language source code package. Being shareware, though, you have to
hunt for it, rather than just point-and-click in synaptic.
Informally known as the "
swiss army knife" of image viewer/editors,
xv really ROCKs!
I often wonder why Windows users have such a hard time posting photos, and the answer is probably lack of something as lightweight (to use) and capable as this.
Cheers