2017-01-25, 10:59
(2017-01-24, 15:57)noggin Wrote: If you want to be fully complete - then you can also consider that the HDMI 2.0 4:2:0 8-bit YCbCr 2160/50-60p mode can be carried at the lower, HDMI 1.4b clock rate (which is how NVidia and Sony were able to upgrade graphics cards and TVs with HDMI 1.4b physical hardware to support this bit of HDMI 2.0)
Agreed, but that's why I stated "uncompressed" 4K@60p. 4:2:0 has compressed chroma, thus requires lower bandwidth, thus fits within HDMI 1.4 bandwidth.
(2017-01-24, 15:57)noggin Wrote: You only need the HDMI 2.0-specific higher bandwidth for the 2160/50-60p 4:2:2 and >8 bit 4:2:0 modes I believe. (There isn't a 4:4:4 RGB or YCbCr implementation for >30p at 2160p even with HDMI 2.0)
"4:4:4 RGB" is another misconception, because 4:4:4 (or 4:2:2 or 4:2:0, etc.) denotes luminance and chroma subsampling (=compression) of YCbCr color space. There's no such thing in RGB color space, RGB is always uncompressed (=fully sampled as opposed to subsampled).
HDMI 2.0 can carry 4K@60p in RGB and YCbCr 444 at 8bpc. >8bpc@60p apparently requires compression.
(Bear in mind it's not a problem for 4K 10bpc movies as movies are running @24p and HDMI 2.0 can carry 4K up to 30p in RGB and YCbCR 444 at up to 16bpc)
Btw just stumbled upon nice summary here, when verifying my statements:
http://blog.toonormal.com/2014/01/10/4k-...eep-color/
