[flajpan]

Mislim da se to zove transparent background, a evo nekih tutoriala:

http://www.mediacollege.com/adobe/ph...arent/gif.html

http://www.absolutecross.com/tutoria...nsparent-gifs/

http://www.ehow.com/how_2029201_png-photoshop.html

Naišao sam na info da ovi formati: GIF, TARGA, PNG, TIFF podržavaju transparent background, a preporuča se PNG (multi transparency).