Add "Falloff" post processing effect. `PostProcess.Get<StandardPostProcess>().Falloff`
The falloff post processing effect lets you create a distance based falloff on all the existing post processing effects. This lets you create effects such as "keeping the background black and white whilst keeping everything close to the player in color"
https://files.facepunch.com/ognik/1b1611b1/2022-01-19_07-16-4777c436-c23f-4ee5-b462-d1fce508a2c5-WH9GCPBk.jpg