Wow. I've been playing around with Wilbur, and this is one nice bit of freeware. I'm slowly finding that it can do just about everything that I thought would be better done in GIMP re: removing some artifacts from a heightmap I have of Venus.

One thing I can't figure out is altitude and latitude shading.

How do I set the colors for altitude shading? Specifically, how do I reset the snow line? I'm in Texture>Altitude Shading. My map started out as grayscale 0 to 255. I set sea level at 67. I want to make everything above 120 white, and scale the other land colors from there. But I play around with all of the buttons and whatnot and i can't find anyhting that seems to do that. Do I need to make a custom gradiet (God help me)?

The latitude thingy, as near as I can tell, doesn't do anything. I've seen that a while ago there were problems with it in multi-core processors. Is this still so?