"Color is like cooking. The cook puts in more or less salt, that's the difference!" (Josef Albers)

Installation: Extract the Archive in "The Witcher 3\bin\x64" . Set the Gamma Value ingame to 1.00 (Default)

Uninstall: Just delete the Files.

How to remove film grain:

1. Go to the folder where you installed the files, and enter the sweetfx folder, that you just put in.

2. Open sweetfx_setting with notepad

3. Edit the first 1 in the line "#define USE_FILMGRAIN 1 //[0 or 1]" to a 0

Active Effects:

TECHNICOLOR
LIFTGAMMAGAIN
TONEMAP
SEPIA
FILMGRAIN (Optional, Optimazed for WQHD)
DITHER

!Update!

I added a Version without Filmgrain

Thanks to Ceejay.dk for his Great Work.