[von Tom (Tom)]

Thanks for the comments guys.

Attached is a detail shot of the Seas of Tranquility and Serenity with the light at constant 1 degree angle of incidence coming from the SSE (the Sun could never do this!) and viewed at an oblique angle.

What the image shows is the relatively large vertical difference between the Sea on Tranquility (blue, to the left) and the Sea of Serenity (brown, to the right).

Marc - I guess it could be converted to use as a bump map.

Cheers,

Tom