So I scanned some real objects with two colors from two different angles to
produce an image that should more or less be a normal map.  I'm wondering
if anyone knows of a quick/easy way to convert these images into height
fields.  I think I could run it through some 4-dimensional derivative to
get something right, but I'm not positive.

with the y-axis being straight up, I have a red light coming from the x
direction and a green light from the z.  My vectors are <red,green> with
values from 0-255 with <128,128> being straight up, <255,128> pointing to
positive x, and <128,255> pointing to positive z.

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