Credit to mikeywander (https://www.nexusmods.com/reddeadredemption2/users/4475377) the creator of this Reshade preset.
More details here: https://www.nexusmods.com/reddeadredemption2/mods/198

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Install vkbasalt
Unzip 'Absolute Correction for RDR2 (vkbasalt).zip'
Copy all the contents of the 'Absolute Correction for RDR2 (vkbasalt)' directory to the directory which contains RDR".exe

For Steam add ENABLE_VKBASALT=1 to your launch options.
eg
ENABLE_VKBASALT=1 %command%

For other launchers(?) just make sure ENABLE_VKBASALT=1 is set in the enviroment.

The Pause key toggles the effects. This can be edited in vkBasalt.conf
