Understood.
Regarding the use of Paint.NET for editing Steel Panthers graphics
always disable the antialiasing (edge smoothing) feature when painting or you will get problems with the palette. Also the Resampling option "nearest neighbour" should be used when resizing images.
One problem I had when making diagonal graphics for the TERrain graphics was that by default Paint.NET's "Rotate / Zoom" feature always applied edge smoothing and there was no way to disable it. Then I found the "dpy" plugin pack and specificaly the plugin "Rotate/Zoom+" that solved this problem. It is an important plugin for anyone using Paint.NET to edit the TERrain files in my oppinion.
http://forums.getpaint.net/index.php...643-dpys-pack/
After installing the plugin you can find "Rotate/Zoom+" under the "Effects/Distort" menu in Paint.NET.