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Old 03-04-2014, 05:20 PM - Thread Starter
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A QD Vision white paper from this January I ran into on 'Full Gamut' (FG) Color and quantum dots...

http://www.qdvision.com/stuff/contentmgr/files/0/a28995fc8c4c938329c050276ccf47b0/pdf/qdv_whitepaper___color_matters___january_2014.pdf

-fafrd
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Old 03-08-2014, 06:18 PM - Thread Starter
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Just ran into this blog on wide color gamuts from Nanosys: http://www.nanosysinc.com/dot-color/

The 6th blog down from July 23, 2013 is interesting, showing Pointer's gamut versus DCI-P3 versus Adobe RGB and a proposed 'Hybrid DICP3/Adobe RGB Gamut:

"What about a hybrid, custom gamut?

What if we combined the green from Adobe with the red from DCI-P3 and their shared blue point? We’d end up with pretty good, high 90’s percentage coverage of Pointer’s gamut, coverage of all of the existing HDTV broadcast content, full coverage of cinema content from Hollywood and a superior ecommerce experience with most of the colors from the natural world covered."
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Old 03-08-2014, 09:22 PM
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Originally Posted by fafrd View Post

"What about a hybrid, custom gamut?
Jansen discusses getting larger gamuts with different sets of 3 primaries, more than 3 primaries (a la Quattron), and the ACES standard for a universal representation that uses 3 imaginary primaries, here: http://www.tftcentral.co.uk/articles/content/pointers_gamut.htm#_Toc379132065. The last is reminiscent of Dolby's Atmos, where a recording carries information about the actual direction of a sound source and the playback system interprets this as best it can, given the speaker setup in the theater/listening room.

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Old 03-09-2014, 01:32 PM - Thread Starter
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Quote:
Originally Posted by fafrd View Post

"What about a hybrid, custom gamut?
Jansen discusses getting larger gamuts with different sets of 3 primaries, more than 3 primaries (a la Quattron), and the ACES standard for a universal representation that uses 3 imaginary primaries, here: http://www.tftcentral.co.uk/articles/content/pointers_gamut.htm#_Toc379132065. The last is reminiscent of Dolby's Atmos, where a recording carries information about the actual direction of a sound source and the playback system interprets this as best it can, given the speaker setup in the theater/listening room.

Thanks for the link - so from a layman's perspective, this ACES stuff essentially means dragging this image/movie/display industry from 6 or 8 or 10 or 12-bit integer representation of colors to floating point representation (only about 30 years after the personal computing industry made the same move :-)

Obviously make a great deal of sense but who knows how much longer that will take to materialize in the form of viewable content and supporting equipment...

It seems like the standard for 4K/UHD needs to be wrapped up relatively quickly (end of this year) or the industry starts to run the risk of stalling the momentum they have started towards 4K as the next 'big thing' in home cinema. Are you keeping on top of how those standard discussions are evolving? My limited sense is that they want to specify rec.2020 as the gamut within the standard but know that they will need to support legacy rec.709 displays as well as WCG displays supporting less than full rec.2020 (such as ~80% rec.2020). Does this ACES stuff have anything to do with the discussions of the new UHD standard?

At least DCI-P3 is a real and meaningful target within the cinema industry - they already have many films mastered to that standard and it would represent a step-up from the current rec.709-based bluerays we get today.

On the one hand, it is a bit shocking that panel manufacturers can put out WCG panels with no more specific indication of actual color gamut than that, but on the other hand, the results ultimately speak for themselves in terms of the quality of the displayed video, so there is an inherent reality check involved in the TV industry display of colors that prevents anyone from being too dishonest... (as (compared to contrast ratios or refresh rates for example, where it is the wild west and everyone defining their own individual and essentially meaningless specs to justify the biggest number they can imagine...).
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Old 03-09-2014, 02:28 PM
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Are you keeping on top of how those standard discussions are evolving?
No, not except for an occasional web search. I am most interested in solutions to the distribution problem: how can enhanced video (and sound) be sent by net, blu-ray, cable, satellite, broadcast in a way that upcoming devices can display it. Using Dolby's ideas about metadata, we don't necessarily have to have agreement about, e.g., what wide gamut standard to adopt. We just need a protocol that lets the digital form of a program announce what gamuts it contains data on, how many bits per color, and so on, and once the protocol is known, the various TV manufacturers can compete with each other to show the nicest pictures for all the data formats in use. "I am a 4k video using 10 bit color in the DCI-P3 and rec 709 gamuts; display me."
The blu-ray people seem not to have gotten beyond committing to the 4k resolution part.

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Old 04-02-2014, 03:33 PM
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The blu-ray people seem not to have gotten beyond committing to the 4k resolution part.

The BDA or Blu-ray Disk Association seriously need to make decisions on what the new format will have as a standard. Will probably be stuck with what they choose for a long time, they should choose wisely and not cripple the "more pixels over better pixels". marketing that's being thrown around. Rec 2020, 422, 12bit, UHD and all frame rates up to 60fps.
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Old 04-02-2014, 10:36 PM
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Sorry for this retarded question but does 4K resolution on a Blu-ray disc limit in anyway what audio you could also have on the disc?

If you could have 4K music concert movies in 4K with surround sound AND 3D on at least a 110 inch screen--that would be NICE!!!
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Old 04-03-2014, 10:16 AM
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Sorry for this retarded question but does 4K resolution on a Blu-ray disc limit in anyway what audio you could also have on the disc?

If you could have 4K music concert movies in 4K with surround sound AND 3D on at least a 110 inch screen--that would be NICE!!!
It could potentially increase the needed bitrate for the video. If the bitrate goes up you can't put as much stuff on the disc. Some of this all depends on the compression efficiency of the HEVC/H.265 codec. If they hit the 2x number they're targeting a 4k HEVC stream won't be much larger than a FHD AVC/H.264 stream. Frankly speaking, most Blu-Ray discs use needlessly high bitrates that are totally unnecessary for FHD AVC/H.264 video so 4k HEVC shouldn't really pose any problems.
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Old 04-12-2014, 11:20 AM
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From the interview with the gentelman from the NAB show that Scott Wilkinson did , the guy mentions that data doesn't seem to be an issue with UHD on a disk it's more about the other details like, what gamut, bit depth etc will be used for the specs. It could take a while maybe even years to hammer this stuff out. The committee consists of manufacturers, friends, competitiors and lawyers, imagine being in that room. The other thing is manufacturers of displays would have to figure out ways to get to this new gamut of rec 2020 and higher bit depths within resonable prices for the consumers. From what I know is that HDMI 2,0 already supporst Rec 2020, 422, 60fps and 12 bits. What we don't know is if this is what the nextgen UHD bluray will have as the spec. I really hope they don't keep Rec 709 , 4:2:0, 30fps and 8 bits. Better pixels over more pixels.
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