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SvennoJ said:
I did some testing, and so far I can't see any benefit of HDR and actually get slightly better contrast with HDR off. At least it doesn't look worse as long as you make sure the tv isn't set to HLG (which makes it look washed out) From what I can see it's sending the same signal as GT Sport, YUV422(HDR), wide color HDR10. However GT Sport looks completely different with HDR on and off. Night and day difference. In RDR2 no difference. (at least where I am atm)

However when you turn HDR off you also lose wide color as it then switches to RGB full, an 8 bit signal. That does mean that you get full color without HDR as YUV422(HDR) is a chroma subsampled signal halving the horizontal resolution for color. (Which actually doesn't matter since RDR2 is upscaled from 1920x2160, half the horizontal resolution in the source format as well. Perhaps that's why the devs chose that specific resolution)

So

HDR on -> YUV422 BT.2020 color space HDR 10
HDR off -> RGB full color (8 bit)

Visable difference: negligable except the image pops a bit more without HDR due to slightly higher contrast and menu backgrounds appear greyish with HDR on.

I guess I'll be playing it with HDR off since my TV can do better processing anyway. I'll figure something out to get the colors better and will be playing that anyway. I was expecting to have a huge contrast difference with dark and bright areas but that's unfortunately not the case. 



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