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You can use GIMP simply for the saving part.Here's a tutorial that includes some steps for making a height-map: https://feral-heart.com/smf/index.php?topic=62143.0You can also try using & modifying (copy and paste your heightmap into it) this:http://www.mediafire.com/view/ausqlcih5y3qd3v/TestHeightmap.jpgIt's just a flat, standard heightmap for getting started... it has everything set up already.You'll have to put it somewhere fh can find it though.Also: You can change the .jpg to .png by using "file > save as" if you want to keep using .png, which makes the map smoother. =)