Gimp, or the GNU Image Manipulation Program, comes to Windows from a great start in Linux. The Gimp is the Ultimate in image editing programs.
This progam has a free-floating interface that allows the user to use the full desktop envorenment to create or edit images.
This progams installs somewhat slowly, but it's well worth the wait. The Gimp also appears to be a Photoshop clone, but this couldn't be further from the Truth. Once you start working with it, you'll find you're creating stunning art that rivals the best most expensive art programs available.
The Gimp supports all the major graphical extensions such as .gif, .jpeg, and .png and allows users to save their art in any format they wish.
The best thig about The Gimp is its price FREE. Afer mastering Gimp you will never buy another imaging program again.