I did the following (GIMP 2.6 on Ubuntu):
1. Downloaded from the link mentioned by Julius.
2. Unzipped the exe as suggested by messie.
3. Dragged insane.py into ~/.gimp-2.6/plug-ins.
4. Made the file executable.
5. Ran GIMP.
6. Use GIMP to convert your image from *.jpg or *.png or whatever to *.tga.
7. Using Filters/Python-fu/Test/insane pulls up an InsaneBump menu.
8. Enter the name of the *.tga file as the "File Pattern" and hit OK.
9. It cranks and generates lots of new files that are presumably the maps. I'm a noob, so I have no idea if they're good or bad.
I did the following (GIMP 2.6 on Ubuntu):
1. Downloaded from the link mentioned by Julius.
2. Unzipped the exe as suggested by messie.
3. Dragged insane.py into ~/.gimp-2.6/plug-ins.
4. Made the file executable.
5. Ran GIMP.
6. Use GIMP to convert your image from *.jpg or *.png or whatever to *.tga.
7. Using Filters/Python-fu/Test/insane pulls up an InsaneBump menu.
8. Enter the name of the *.tga file as the "File Pattern" and hit OK.
9. It cranks and generates lots of new files that are presumably the maps. I'm a noob, so I have no idea if they're good or bad.