Talking about this edit by anon.
To me, it sounded like modding method was tinkering natively with the game and altering other stuff as well as with SweetFX is external color adjusting. Of course there's issue that mod author is furious about mirrors of the mod and makes it harder and harder to find official download link anywhere (tried to look for entire steam thread, but only found those mirrors). Also screenshot seems to have been taken with sweetFX before turning it into mod section.