Quote Originally Posted by RobA View Post
So it takes two greyscale maps, temperature and moisture, and picks the colours based on that funny looking image?

-Rob A>
In FTPro, it's based on climate (temperature and rainfall models) and applied under Map>>Show Other Shader>>Show Image Climate. Terraformer (by Bill Roach and available for free from Pro Fantasy) has several dozen of these images along with several Cloud/Weather Pattern Overlays. As for how it was accomplished in Photoshop, a2area would have to explain that.

GW