Adobe Photoshop is a well known program for graphic designers and photographers that can be used to manipulate images, photo enhancement, photo retouching, and much much more. This web page is not related to web proxies, I just wanted to show you some valid free and open soruce alternatives to the commercial program Adobe Photoshop. Feel free to contact us if you have other programs to recommend.
Krita is an amazing and FREE digital painting and illustration application. Krita offers support for CMYK, perspective grids, dockers, filters, HDR painting, painting assistants, multiple brush engines and blending modes, masking tools, color management, and many other features you would expect. Check the gallery to find some artworks made by Krita users or watch the video tutorials to learn to use Krita.
GIMP is the GNU Image Manipulation Program and it is very popular among Linux users. It is a very good application for photo retouching, image composition and image authoring, image editing, photo enhancement, and much more. It supports almost any operating systems, including Microsoft Windows, GNU/Linux, Mac OS X. It support many image file formats, including multi-resolution and multi-color-depth Windows icon files.