Will you get the better picture if you disable HDR in the PS4 options for non-HDR games? (Due to chrome subsampling)
If you enable HDR and set output to 2160p - RGB in the options you will only get YUV420 or YUV422, which is chrome subsampled, this reduces the picture by 1/2 or 2/3 and is not lossless. Without HDR enabled you get full RGB (no subsampling) if you set output to 2160p. This is because of the limitations of the HDMI 2.0 specifications, there is not enough bandwith to support 4K 60hz with 10bit/12bit color without chrome subsampling.
So in theory you will only get a non chrome subsampled picture if you disable HDR, for HDR games the quality gain from HDR will certainly outweight what you lose from the subsampling. But for non-HDR games you get a somewhat better picture (might be difficult to spot) if you disable HDR in the PS options.
Is this thesis correct? Does anyone have more input on this?
Posted Nov 9, 2016, 10:01 PM UTC · edited
You can not get 4K 60hz 10bit HDR RGB due to bandwidth limitations.
Hz is not frames per second. And you can still get playable fps with 4K 10bit HDR RGB.
Right but that's not what I mean, what I mean is that 4k 10bit HDR RGB/YUV444 is NOT possible @50/60hz with HDMI 2.0. You can check the HDMI specification here for example: http://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx#146
If you set HDR to ON and mode to RGB, you get YUV 4:2:2 at maximum.
I said that.... But again, hz is not fps. You can still get 60fps at 30hz, it just won't look as smooth as if it was also 60hz.
I know the difference between HZ and FPS. 60fps at 30hz, would still feel like 30fps... But more importantly: There is no 4k 10bit HDR RGB 30hz mode. The PS4 Pro outputs 4k 10bit HDR 4:2:2 or 4:2:0 60hz even if you select RGB. So I believe it's better to go 8bit (disable HDR) if you are playing non-HDR games to get RGB. Not sure if the PS4 would do that automatically...
There is too a 30hz mode... http://www.avsforum.com/forum/attachment.php?attachmentid=507361&d=1422435396
It can't go above that though. 30hz is the ceiling at the moment for 4:4:4.