[viking4570]

Thanks everyone that clarifies it - what is the easiest way to reset map_h to sea level? so, for instance, if the height ranges from say 500 meters to 1500 based on the curves obtained from microdem, to reset so that map_h is 0 to 1000 meters? I've been using gimp and is there an easy way to basically step down the whole range of rgb values at once? Thanks! - viking