photo editing

I'm looking for photo editing software like adobe photoshop but that's free. I am looking to edit my pictures so that it's black and white except from a particualr colour or object. Some one help me please

http://www.mac-forums.com/forums/im...raphy/125584-free-photo-editing-software.html

http://www.mac-forums.com/forums/im...otography/90508-photo-editing-common-man.html

http://www.mac-forums.com/forums/im...photography/83248-photo-editing-software.html

http://www.mac-forums.com/forums/im...599-looking-simple-photo-editing-program.html

http://www.mac-forums.com/forums/windows-classic-linux-other-os/12078-photo-editing.html

You might like The GIMP (GNU Image Manipulation Program).