Good Reshade

Reshade does not make significant changes to the game's graphics, but it improves them. This tool allows you to add various post-processing effects such as lighting enhancements, color correction and anti-aliasing, which makes the image more pleasing to the eye and realistic.
Installation:

1. Download Reshade.
2. Install Reshade for PlayRDR.exe.
3. Complete installation.
4. Paste the file from the archive into the Red Dead Redemption directory (where PlayRDR.exe is located)
5. Launch RDR, press the Home key on your keyboard and select the installed preset from the list.