Here is my custom filter, based on the original S1-Dynamic game filter. I changed the brightness, contrast, gamma and saturation, changed the auto-exposure to a less bright sky, the glare of cars, lights and LEDs was increased and solar rays are most evident.
There are two versions:
warm - brighter colors and a warmer image
normal - slightly saturated colors, but without change in color temperature
Note: the Color Saturation should be at 100%
Installation: copy the files to Steam\steamapps\common\assettocorsa\system\cfg\ppfilters
I hope you enjoy.
Update 03/31: The screenshots have been updated to show the changes in accordance with the latest version.