Re: [Avid-L2] Re: Color Space for UHD theoretical and practical application?

 

Throwing my two cents in here.

Within the industry we joke that it was called BT.2020 because the ITU hoped that by 2020 TV panel technology would exist that could actually hit it!

The reality is that outside of laser-backlit displays, no display technology can hit BT.2020. OLED comes the closest, followed by LCDs using cadmium-based Quantum Dot enhancement film. (Technologically, laser-based TVs are insanely expensive and cadmium-based QD film isn't viable as TVs or displays using it cannot be imported into the EU as they cannot be RoHS compliant as long as they include cadmium.)

As mentioned by Pat, the UHD Alliance is leading a move for consumer televisions towards DCI-P3 gamut support. It is likely that will be the target for a while. The UHD Alliance Premium target of 95% of DCI-P3 areal coverage is readily achievable using LED backlit LCD or OLED technologies.

That said, the typical consumer UHD TV isn't anywhere near this gamut. Indeed, the typical consumer UHD TV can't even achieve 90% of BT.709! 

I sit on several technical working groups for the CTA and VESA and late last year, during a meeting to codify gamut classifications for display devices engineering representatives for more than one TV manufacturer (which will remain nameless to protect the guilty) argued that "wide gamut" should be the term used for displays that can hit 100% of BT.709. You could hear the jaws drop on the con call, but they were dead serious!

See some of you all at Avid Connect and NAB.

-greg

On Thu, Mar 30, 2017 at 5:25 AM, jonathansabrams@yahoo.com [Avid-L2] <Avid-L2@yahoogroups.com> wrote:

 

A Rec 2020 pixel (singular) is only better in three respects.

1. It has a wider color gamut, often referred to as WCG.

2. It COULD be 12-bit.

3. It COULD be 4:4:4.

Consumer displays bought after January 1, 2016 are more likely to be Rec 2020 compliant. Before that date, most consumer panels had 4K pixels with Rec 709 performance.

For reasons I do not fully understand (physics), the only display mechanism that COULD be fully Rec 2020 compliant is a laser projector. No other display technology, as of this posting, is capable of 100% Rec 2020 color gamut (WCG). My memory is that if you can find a display with ~80% or greater coverage of Rec 2020 color gamut that you were close to the limit of what non-laser display technology is capable of reproducing.

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Posted by: Greg Staten <gregstaten@gmail.com>

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