A quick search turned up nothing, so here goes…
I am trying to make a planet Earth from the maps located http://planetpixelemporium.com/earth.html. I’ve obviously set mapping to sphere, color map to color, bump to normal, specular to spec, lights to emit. The problem comes with the cloud layers. I inverted the colors of the cloud layer transparency and added it as a mask to the cloud layer (using GIMP). I then applied it as a color map, using sphere mapping and the alpha channel. It works more or less alright, the following being a very quick test. http://img205.imageshack.us/my.php?image=hrm2op7.jpg
But when I do the same for my Earth UV sphere, there is odd color distortion - the clouds look like infected patches on the planet, rather than independent floating clouds:
Notice the western part of North America. Is there a way to fix this problem? I’m sure it’s something embarrasingly simple, but it has eluded me.