I believe the issue is the difference between reflective light and refractive light. The fuzzy animal absorbs most of the light with very little bounce back to the camera (refractive). The diesel reflects most of the light even with corn starch or flat white paint or whatever (reflective). I think the ultimate personal scanner will end up being a combination of light and infrared technologies and much better / smarter scanning software. The test piece that you use to register the scanners is hard black and hard white squares. The current state of the software can handle that. It cannot handle anything in between, it just sucks! Russ