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Nothing Special, just Nvidia Freestyle. =)
Ingame Settings are all on High (Res:2560x1440), except Motion Blur (Off),
but you can turn it "On" if you like it.
+Use the Filmic Mode.

Step 1: Open NVIDIA Geforce Experience & activate the Ingame Overlay.

Step 2: Start Subnautica Below Zero, press in the Mainmenu "Alt+F3" & select a empty profile 1, 2
or 3.

Step 3: Add "Brightness/Contrast" and set it up like this:
Exposure = 0%
Contrast = 0%
Highlights = 100%
Shadows = 12%
Gamma = 0%

Step 4: Add "Color" and set it up like this:
Tint Color = 20%
Tint Intensity = 30%
Temperature = 0.5
Vibrance = 0

Step 5: Add "Details" and set it up like this:
Sharpen = 20%
Clarity = 100%
HDR Toning = -100%
Bloom = 15%

Step 6: Add "Sharpen" and set it up like this:
Sharpen = 25%
Ignore Film Grain = 100%


Now you're done & it must look like on the Screenshots.
-Have Fun.^^