PNG is lossless and 32-bit (includes an 8-bit alpha) You really can't improve on that.
Are you having a problem getting files that are full sized? When you say "very small" do you mean in pixel dimensions or small in megabytes?
Rob Mack
Former user
wrote on 5/19/2007, 6:02 PM
If you are speaking about the resolution of the PNG or JPEG files, if you are using standard def video, the files will only be 720 x 480 pixels with a dpi of 72. That is the standard video resolution size.