A free mod for Witcher 3, by Amioran.
The Real Graphical Suite is a collection of three high-quality presets that can be applied to your game to make it look like it is coming from a particular place or source. The idea is to have one that can be used in every sort of game, but the most important thing is that the look is as close to the source as possible.
All the presets are optimized to work with the most common video cards and monitors, but if you have an unusual or custom setup, then the last option is for you.
The first option is the most common and it is made to look like it is from the E3 2014 gameplay demo.
The second option is the best for those who like a darker atmosphere, as it can be used in conjunction with the previous option.
All these options can be applied to your game with the Cutscene mod, and they can be used without having to modify any of your files.