What is SDR2020 - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 8 Old 11-12-2017, 08:17 AM - Thread Starter
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What is SDR2020

Is SDR 2020 considered UHD/HDR or is it something in between Rec 709 and Hdr 2020
How do you approach calibration for this color space?
thanks

Dan
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post #2 of 8 Old 11-14-2017, 02:47 PM
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I believe people refer to "SDR 2020" as simply the Rec. 2020 color gamut being used without HDR meta-data.

Rec. 709 is yet another color gamut with different primaries than Rec. 2020. It covers less of the human visual system.

UHD is a resolution.
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post #3 of 8 Old 11-14-2017, 07:39 PM
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The Rec. 2020 colorimetry is standardized in ITU-R BT.2020, but that is not all you all you will find there. That same document also specifies other aspects of a UHDTV video signal including the allowed resolutions (either "4K" 3840x2160 or "8K" 7680x4320) as well as the transfer function (gamma) which is the same as that of Rec. 709.

The Rec. 2020 standard does not include anything related to HDR since HDR did not exist at the time. It was only later that the Rec. 2020 color gamut was also adopted for HDR formats. So it is actually redundant to say SDR 2020. It should be calibrated the same way as Rec. 709 just with the wider color gamut instead.
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Last edited by EvLee; 11-14-2017 at 07:42 PM.
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post #4 of 8 Old 11-15-2017, 03:42 AM
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Yep - ITU 2020 is the standard for UHD resolutions and colorimetry. It has different colorimetry (i.e. colour primaries and RGB->YCbCr mappings) to ITU 709/1886 (which defines HD) and 601 (which again is different and defines SD)

ITU 2020 includes a wider colour gamut than 709/601, but it is still SDR in scope as it doesn't include any HDR elements, and only specs SDR gamma ISTR.

The current main HDR specs for UHD content all basically take ITU 2020 (i.e. UHD SDR) and add various HDR solutions - either using PQ (HDR10 and Dolby Vision) which is based around SMPTE 2084 I believe (I may be wrong) or Hybrid Log Gamma (BBC/NHK HLG) -

So as standard 'Rec 2020' content is SDR - as that spec doesn't include any HDR elements. It's only when you add SMPTE 2084 HDR into the equation that you end up with HDR Rec 2020 stuff.

Technically it IS possible to use HD ITU 709 colorimetry for UHD (in fact early UHD tests did so) AND it is also possible to use HDR techniques with 709 colorimetry too - though I've not seen any outside the test labs.

HOWEVER - what seems to have happened is that 2020 has become shorthand for HDR, as many consumer sources of 2020 content (mainly UHD Blu-ray) are also HDR...
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post #5 of 8 Old 11-26-2019, 02:40 PM
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sounds like Rec2020 is your main set of colors, WCG. HDR is like a "metadata add-on"



Its ashame the industry confuses consumers like myself; thinking that HDR and WCG are both required for each other; as if you can't have one without the other.

So many display devices out there with HDR compatibility but no real capability; or limited HDR capability.



Well, my Panasonic UB820 is showing me beautiful WCG SDR bt2020 video w/o HDR and my 4K UHD discs have never looked better! Simply wow. It is beautiful. ycbcr444. Who needs HDR? Not me! ; )
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post #6 of 8 Old 11-27-2019, 12:57 AM
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Universal audio/video receiver (Dolby Atmos, DTS:X, etc.) is achieved.
Universal HDR TV (HDR10, Dolby Vision, HEVC HLG HDR, VP9-HLG / VP9-PQ YouTube HDR, Dynamic HDR) is required.

Push for universal HDR TV!
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post #7 of 8 Old 12-02-2019, 01:43 PM
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SDR bt2020 WCG w/o HDR; perhaps the greatest thing since sliced bread
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post #8 of 8 Old 12-02-2019, 01:49 PM
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Quote:
Originally Posted by am2model3 View Post
SDR bt2020 WCG w/o HDR; perhaps the greatest thing since sliced bread

Even better than sliced bread...
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Reply High Dynamic Range (HDR) & Wide Color Gamut (WCG)

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