Johannes, I'll try to dig out the references to Geotiff format. If I'm remembering correctly, it uses 32 bit floats as well. You might like to look it over for ideas. I think Agent Smith has or had Tiffer in the Bryce backroom. If not I'll try to dig it out of mothballs and set up my webpage on angelfire again. I've been meaning to set my webpage again and it would be an excuse to do so. I don't think it would be much good to you as a plugin in it's present form. It is a dos box tiff to pgm application (I was too lazy to do it up in windows). I since started on converting it to windows last year but somehow lost the drive to complete it. -TJ