What you want is to select a preset and copy/paste it into your sweetfx configuration file, once you get used with it you can also create your own presets. DarkD3 was nothing more than 3-4 preset in a cool website for easy use.
Free, cool, light and better: I have been using it to improve my games quality (and sometimes framerate) for the past 2 years and half without a single problem. Diablo 3 included, because it doesn't change a shit, simply adding graphic filters on your screen. Enjoy