Is there some free program that would let me draw a greyscale heightmap and then assign colours for heights and automatically output both the heightmap and colourmap images?
Height and colourmap sculptor?
Miscellaneous Forums/Content Creation Tools/Height and colourmap sculptor? try l3dt is free and does an excelent job of making colormaps. plus you can edit in 3d or 2d.
Cheers, that seems to be exactly what I am after.