Dang, SumDim with the douche'ish response. If average, non-expert users are supposed to be able to read and analyze the log files, why even ask them to post them? Let's all dig around in the source code while we're at it, too, to solve our problems, instead of asking for support on the support forum.
Apex, judging from the logs, you changed your video encoder from x264 (CPU based) to NVENC (GPU based). Due to known bugs that you can read about on Nvidia's forum, this can make your colors appear too light or too dark, sometimes on a player-by-player basis (VLC especially). As I understand it, it's because the color range is being widened to 'full' in TWO different places. Going from 'Limited' to 'Full' range will make washed out colors darker (yay!) Converting Full to Full, though, will make the image way too dark, with blacks appearing crushed (boo).
If you're checking your video in VLC and the color seems borked, it may not ACTUALLY be borked; you just need to change some settings with the way VLC works with your video card to play back video. I recommend you upload your video to YouTube to see if the color looks good, there.
If the color really IS extra dark and it's not just your video player making it appear that way, you can go into OBS Studio's settings and set the color range to Limited. This will compensate and bring the color back to normal, I believe.
I had this exact same problem when I switched to Nvenc encoding. Colors look fine on Twitch and YouTube, though. I dug around in my driver and VLC settings to fix the dark colors there.
Good luck.