I wanted to see if it would be easy to create a "pure" elevation model starting with an already-created brightness overlay on an elevation model.
I tried it with a Venus global image at 180 degrees, using PIA00159 as the combined brightness/elevation model and trying to remove the RADAR-brightness part which I got from PIA00104 (after converting to black and white to match PIA00478). It ain't perfect, but it is a start.
Here is the flow:
Click to view attachment
Resultant full-res Venus derived colorized DEM is here: http://www.flickr.com/photos/31678681@N07/4618186455/