importing a heightmap

hey guys, got a quick question, I have recently been fixing up my terrains by exporting the heightmap as a bitmap and modifying it in an art program, now I am interested in importing the image back into torque as a heightmap. Unfortunately I cannot seem to find the option in the editor that does this, does anyone know where it is? (I'm assuming there is one, why else would their be an exporter for the heightmap?)