There have been discussions on GC forum about this; the canonical way is to export a 16 bit .TIFF and use it to drive a procedural terrain. I am investigating other avenues but currently have nothing to show.

Anyway, I recently realized that this sharpeness thing is somewhat pointless: as soon as you add a realistic texture to the terrain, all tiny heightfield details are drown by the texture fine details.

Bye!!!

P.S.: for any further info, ask Cajomi on GC forum, he is the guru on this (and others ;-)) subject.

GIMP 2.7.4, Inkscape 0.48, Genetica 3.6 Basic, FilterForge 3 Professional, Blender 2.61, SketchUp 8, PoserPro 2012, Vue 10 Infinite, World Machine 2.3, GeoControl 2