I created this ReShade starting from my preset "1979 MOVIE IMMERSION" for Alien Isolation, with updated SHARPEN and RTGI shaders by Pascal Gilcher. The goal is to achieve a more realistic lighting rendering, especially for interiors, and a less saturated and sharper image. The Launchpad, mxao and Sharpen "IMMERSE" shaders are available by installing the latest versions of Reshade, while the RTGI shader is paid, obtained through a subscription on the author Pascal Gilcher's Patreon.This preset is relatively demanding on the PC. My system consists of an i5 9600K CPU, Intel ARC A770 16GB, 32 GB DDR4 RAM, and a Samsung 980 PRO 1TB Hard Drive. The game runs in vanilla mode at a resolution of 1080p, all settings set to ULTRA at 60fps. With this shader enabled, the framerate varies between 40 and 30 fps when using Vulkan libraries, which seem to perform slightly better than DX12. For some reason that I can't figure out, sometimes the preset needs to be reloaded to work correctly. Additionally, the CinematicDOF shader makes on-screen text less readable. I hope to be able to resolve these issues in the next releases, including with suggestions from those who want to try the preset.

Installation: download and install Reshade version 5.9.2, find and select the game executable RDR2.exe. In the next step when asked to "select effect packages to install" check "iMMERSE by Marty McFly". At the end of the installation unzip the content of the preset in the game's main folder. When in game, open the ReShade  menu and select the preset "RDR2-MVR.ini". Please notice that the RTGI shader for ray tracing is paid and not included in this preset. Without this shader ray traced effects will not be available.

Reshade download link: https://reshade.me/

Marty McFly iMMERSE Pro Shaders link: https://www.martysmods.com/