skeletonbow: As I understand, many people encounter this problem where the graphics in Dark Forces II out of the box are rainbow coloured and look terrible on AMD hardware, not sure about other GPUs. There are a multitude of potential solutions to this problem out there around the web, including on Steam forums and probably here on GOG forums as well. I ended up finding a solution that worked well for me and was as easy as pie.

Basically, I went into the in-game display configuration screen and 3D acceleration has a checkbox that was not enabled by default. I turned it on, then restarted the game. Problem solved, it was that easy.

That may not solve the problem for everyone, so if it doesn't work for someone then by all means rifle through the threads here and on Steam looking for alternative solutions, but this was ultra-simple for me and worked the first time on my AMD Radeon HD7850. Additionally, it increased the maximum resolution available to me from 1366x769 up to 1920x1440. I chose 1920x1200 which is appropriate for my 16:10 display and it worked flawlessly. Additionally, instead of being limited to 8-bit colour, it extended the options to 16-bit colour depth which looks significantly better.

Other than that, all I had to do was invert the mouse to work like everyone expects it to since the beginning of time, because the developers apparently never played a video game before, but now everything works. :)

Hope this saves some AMD users some time.