I guess, (and I have done it) you can change your size with any stuffs like adobe or any other free picture handling softs. All you can change is your size, but dont try to change as fromnija said "colour, brightness, proportion of hight and bredth etc". I am sure you wont have any problem. btw, if you dont use anything and try to take a pict 300x300 from a digital camera or a scanner, it was be tough as hell. Well that means you have to adjust the picture size anyway...