The image looks more clean if you convert your LDD file to an image file with POV-Ray. You can download the program on the POV-Ray site: http://www.povray.org/ Pick the latest version if your computer can take it. By the way, little warning: It took my computer two full days of non-stop work!
P.S. I tried everything to hook up the tracks on the front of this thing, but it seems to be impossible with LDD.