This sounds like a good idea, but can anybody explain how to do it?
I have the same issue with my AVH-2600BT.
I have gotten some of the 800x480 backgrounds on this site to look OK when I view them in "Zoom" mode, other than small gaps on the side, but when I download them the quality degrades considerably and has artifacts. I've tried other aspect ratios as described here. Everything looks poor when I use it as a background. Frankly, I'm not sure why Pioneer bothered to offer this feature if they can't get it right. It's not like displaying something in full resolution is rocket