Is there a tutorial on modifying making the galaxy template dds file? I tried to some editing in GIMP but GalCiv didn't like it. What I am trying to do is make the centre of the spiral galaxy mostly empty (because I don't think there would be any habitable planets in such a densely packed clump). What I would like to do is make the centre densely packed with stars, gas giants, asteroids and resources but no habitable planets. Not sure if that kind of design is possible but anyway...