Hi Guys currently tagging my Handbraked DVD's and I'm adding artwork, where possible original movie posters. I mainly obtain these from sources on the web and simply copy and paste into the artwork tab in iTunes (get info) or into Metax. I'm finding however that sometimes my posters have a square white background and other times they don't. Obviously must have something to do with the size of the original file I'm guessing. Assuming I can adjust the original file to suit, what dimensions should it be to lose the white background?