Hello RobA!

Sorry, but I've been on Easter holyday, and I couldn't read the forum.

I'm working on a tutorial on how to work with DEM data using GDAL (I don't know if you know GDAL[1] or other OSGeo[2] projects), and how to transform 16bit in 8 bit data to work with "older" GIMP versions.

May be I should be able to post it at the end of the week.

[1] http://www.gdal.org/
[2] http://www.osgeo.org