You can use colour templates, but they may create unexpected results, since Poser will use the "value" instead of "luminance" - this means that primary colours like 100% red are actually the same as 100% white (which is not what you probably intend... :-) With greyscale templates "black" will be a "mountain" while "white" is a "hole" - but this can be easily inverted in Poser when you load the map.