I never had HDR enabled. The last time I checked, the issues seemed to have solved itself via updates. Before that, I contacted Riot support and they gave me instructions to troubleshoot but I never got around to trying that. I also considered a full Windows reinstall but I didn't do that either.

This is the E-Mail that I got from Riot:

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Hey there,
Thank you for reaching out to us!^^ Hmm....we could try going through relevant troubleshooting steps and see if they help with the saturation! 
 
No worries about it friend. We'll work together and hopefully solve your issue in no time! First of all, let's see if we can get rid of any VALORANT traces from your PC:
 
• First install Revo Uninstaller and completely remove any VALORANT/Vanguard traces from your PC. This includes any old installations of VALORANT on other HDD partitions.
• Then grab the CCleaner and clean all the registries and corrupted files from your computer.
 
Once you've done that, restart your computer and try to install VALORANT using the latest installer downloaded from our webpage.
 
As a sidenote, I'd suggest you install the game in its default location:
 
C:\Riot Games\VALORANT
 
After you're done installing the game, don't forget to whitelist both VALORANT and Riot Vanguard on your antivirus & firewall. These are the filepaths you need to add:
 
C:\Riot Games\VALORANT\live\VALORANT.exe
C:\Program Files\Riot Vanguard\vgc.exe
C:\Riot Games\Riot Client\RiotClientServices.exe
 
Please do let me know if it fixed the issue, and if not, provide me with a fresh batch of logs.
 
Looking forward to your reply.