1. type bind y screenshot in the console
2. load your map in the Single Player! to do that open the Single player and type in the console: map xxx (name of your maps .bsp file)
3. type devmapall in the SP console
4. type cg_draw2d 0 in the console
5. type cg_drawgun 0 in the console
6. Type noclip in the Console
7. Make Great screenshots!
8. open ur screenshot in Gamedata/base/screenshots
9. make the shot lighter because in its darker as in the Game
10. make what u want!
11.save the screenshot in the size 256x256 as an .jpg
12.put it in Levelshots!
Easy hu? now ur shot is ready
SW:JK Modding, Mapping and Editing 
a little screenshot tutorial 
Linear Mode
