Freeware Graphics Programe for the Mac?

I recently got a MacBook and I would like to put some free graphics software on there to colour correct my photos and do a little basic icon work on animated gifs. I d/l The Gimp but it's bigger than I need and I don't have the time to learn how to use it. I was hoping that Ulead Gif Animator had a Mac version on offer but they don't. So could anybody make any suggestions for me? Thanks. :)