Sorry for the late reply! It will affect the screenshot if you take a screen capture with SHIFT+WIN+S otherwise the pictures you take with the camera in game wont be affected only you will see the shaders
Same as a reshade for any game. Install reshade from reshade.me into the game folder. Use direct x 10/11 version using that config file from nexus, or open the reshade menu in game and select it then.
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Once done you can open the game and it will download all shaders and you can press the HOME key to open reshade menu and change them to your liking