I cover this in some of the Courses I deliver here in the UK for Broadcasters and larger facilities.
Yes UHD is more pixels but for home viewing screen sizes and viewing difference it makes little difference. 4K isn't UHD and domestic displays aren't 4K.
2K and 4K are DCI sizes for digital cinema.
HDR is additionally contrast information but carried in a way only HDR equipped displays can decode and display. So the signal has the normal dynamic range for non HDR displays and the HDR additional range as extra data.
Colour space is in theory BT. 2020 but thats too expensive for domestic. The UHD alliance has suggested donestic displays try and achieve 95% of DCI P3 colour space (could be 98% can't remember)
P3 is between 709 and 2020.
So outputting 4K for domestic use without at least P3 colour space or HDR isn't gaining much for the viewer.
Hope that helps.
Pat from his mobile.
Posted by: <pat@horridge.org.uk>
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