с фотошоп става по лесно
прочетете този урок за
фотосшоп
http://uroci.net/urok/2532/%D0%9A%D0%B0%D0%BA-%D0%B4%D0%B0-%D1%81%D0%BC%D0%B5%D0%BD%D0%B8%D0%BC-%D1%86%D0%B2%D0%B5%D1%82%D0%B0-%D0%BD%D0%B0-%D0%BA%D0%BE%D1%81%D0%B0%D1%82%D0%B0-%D1%81%D0%B8.html
За Windows :
http://sourceforge.net/projects/gimp-win/files/GIMP%20%2B%20GTK%2B%20%28stable%20release%29/GIMP%202.6.11%20%2B%20GTK%2B%202.16.6/gimp-2.6.11-i686-setup-1.exe/download