Want to use one of my photos as wallpaper on my DI. Have tried various pixel dimensions (800 x 600, 640 x 480, 320 x 480, etc.) suggested on this forum, but the image always turns out to be way too large (i.e. it doesn't fully fit) on the screen. Can anyone tell me what I'm doing wrong? Is it necessary to change the image size in addition to the pixel dimensions??