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Hybrid log–gamma

(Redirected from Hybrid log gamma)

The hybrid log–gamma (HLG) transfer function is a transfer function jointly developed by the BBC and NHK for high dynamic range (HDR) display.[1] It is backward compatible with the transfer function of SDR (the gamma curve).[2] It was approved as ARIB STD-B67 by the Association of Radio Industries and Businesses (ARIB).[1][3][4] It is also defined in ATSC 3.0, Digital Video Broadcasting (DVB) UHD-1 Phase 2, and International Telecommunication Union (ITU) Rec. 2100.[5][6][7]

Chart showing a conventional SDR gamma curve and the hybrid log–gamma curve. HLG uses a logarithmic curve for the upper half of the signal values, which allows for a larger dynamic range.

HLG is an HDR format that uses the HLG transfer function, BT.2020 color primaries and a bitdepth of 10-bit.[8] HLG was designed to be backward compatible with SDR UHDTV. However, HLG is not intended to be fully backward compatible with traditional SDR displays that cannot interpret BT.2020 colorimetry.[8][9]

Both HLG transfer function and the HLG format are royalty-free.[2] The backward compatibility allows them to be used with existing transmission standards when the receiver is compatible with the BT.2020 colour container, reducing complexity and cost for both equipment manufacturers and content distributors.[1][10][9] They are supported by HDMI 2.0b, HEVC, VP9, and H.264/MPEG-4 AVC,[11][12][13][14] and are used by video services such as BBC iPlayer, DirecTV, Freeview Play, and YouTube.[15][16][17][18][19]

Description

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HLG is designed to be better-suited for television broadcasting, where the metadata required for other HDR formats is not backward compatible with non-HDR displays, consumes additional bandwidth, and may also become out-of-sync or damaged in transmission. HLG defines a non-linear optical-electro transfer function, in which the lower half of the signal values use a gamma curve and the upper half of the signal values use a logarithmic curve.[20][21] In practice, the signal is interpreted as normal by standard-dynamic-range displays (albeit capable of displaying more detail in highlights), but HLG-compatible displays can correctly interpret the logarithmic portion of the signal curve to provide a wider dynamic range.[22][23][24] In contrast with the other HDR formats it does not use metadata.[25]

The HLG transfer function is backward compatible with SDR's gamma curve. However, HLG is commonly used with Rec. 2020 color primaries which produce a de-saturated image with visible hue shifts on non-compatible devices.[26] HLG is therefore backward compatible with SDR-UHDTV and will show color distortion on common SDR devices that only support Rec. 709 color primaries.[26]

Technical details

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HLG defines a nonlinear transfer function in which the lower half of the signal values use a gamma curve and the upper half of the signal values use a logarithmic curve.[4][27]

HLG reference OETF is as follows (as defined in ARIB STD-B67):

 

or as follows (as defined in Rec. 2100):[5]

 

where

  • E is the linear light signal normalized by the reference white level in the range   in ARIB STD-B67 and in the range   in Rec. 2100.
  • E' is the resulting nonlinear signal
  • r is the reference white level and has a signal value of 0.5
  • and the constants a, b, and c are defined as a = 0.17883277, b = 1 - 4a = 0.28466892, and c = 0.5 - a ln(4a) = 0.55991073

The signal value is 0.5 for the reference white level while the signal value for 1 has a relative luminance that is 12 times higher than the reference white level.[27] ARIB STD-B67 has a nominal range of 0 to 12.[28] HLG uses a logarithmic curve for the upper half of the signal values due to Weber's law.[27]

HLG reference OOTF is as follows:[5]

 where

  •   is the luminance of a displayed linear component   in cd/m2.
  •   is a signal for each colour component {Rs, Gs, Bs} proportional to scene linear light normalized to the range  .
  •   is the normalized linear scene luminance.
  •   is the variable for user gain in cd/m2. It represents LW, the nominal peak luminance of a display for achromatic pixels.
  •   is the system gamma.   = 1.2 at the nominal display peak luminance of 1000 cd/m2.

HLG reference EOTF is as follows:[5]

 

where

  •   is the luminance of a displayed linear component   in cd/m2.
  •   is the non-linear electrical signal   in the range  .
  •   is the variable for user black level lift.
  •   is nominal peak luminance of the display in cd/m2 for achromatic pixels.
  •   is the display luminance for black in cd/m2.

HLG does not need to use metadata since it is compatible with both SDR displays and HDR displays.[1][3] HLG can be used with displays of different brightness in a wide range of viewing environments.[3]

The dynamic range that can be perceived by the human eye in a single image is around 14 stops.[27] An SDR video display with a 2.4 gamma curve and a bit depth of 8-bits per sample can display a range of about 6 stops without visible banding.[27] Professional SDR video displays with a bit depth of 10-bits per sample extend that range to about 10 stops.[27] When HLG is displayed on a 2,000 cd/m2 display with a bit depth of 10-bits per sample it can display a range of 200,000:1 or 17.6 stops without visible banding.[27]

HLG increases the dynamic range of the video compared to a conventional gamma curve by using a logarithmic curve for the upper half of the signal values.[27] HLG also increases the dynamic range by not including the linear part of the conventional gamma curve used by Rec. 601 and Rec. 709.[29] The linear part of the conventional gamma curve was used to limit camera noise in low light video but is no longer needed with HDR cameras.[29]

HLG is supported in Rec. 2100 with a nominal peak luminance of 1,000 cd/m2 and a system gamma value that can be adjusted depending on background luminance.[5][30]

HLG is supported in HEVC with a formula that is mathematically equivalent to ARIB STD-B67 but has a nominal range of 0 to 1 instead of 0 to 12:[28]

 

where

  • Lc has a nominal range of 0 to 1 and V is the resulting nonlinear signal
  • the constants a, b, and c are defined as a = 0.17883277, b = 1 - 4a = 0.28466892, and c = 0.5 - a ln(4a) = 0.55991073

History

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Inception

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On May 15, 2015, the BBC announced that they had begun work with the NHK to develop a joint HDR proposal that would be proposed to the International Telecommunication Union (ITU).[31] On June 9, 2015, HLG was proposed to the JCT-VC for High Efficiency Video Coding (HEVC) and added to the June 2015 draft of the screen content coding extensions.[32][12]

Later that year, Sony showed HLG video on a modified HDR display at the SMPTE 2015 conference.[33][34] Colorfront announced that their Transkoder 2016 software would support HDR output using HLG.[35] LG announced that their 2015 4K OLED TVs would support HDR from HLG and perceptual quantizer (PQ).[36] Blackmagic Design released an update for DaVinci Resolve that added support for HLG.

SKY PerfecTV! announced that they will use HLG to transmit 4K UHDTV HDR programming to their satellite subscribers in Japan.[37][38] Harmonic Inc. and NASA announced the HDR capture of an Atlas V launch which was broadcast the next day on NASA TV using HLG.[39] Vatican Television Center broadcast the ceremony of the Holy Door using HLG and the Rec. 2020 color space.[40]

2016

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Industry bodies:

  • The Ultra HD Forum announced their guidelines for UHD Phase A which includes support for HLG.[41][42] The Ultra HD Forum also defined HLG with a bit depth of 10-bits, and the Rec. 2020 color space.[42]
  • The ITU announced Rec. 2100 which defines two HDR transfer functions which are HLG and PQ.[5][30]
  • Digital UK published their 2017 specification for Freeview Play which includes support for HDR using HLG.[16]
  • The Digital Video Broadcasting (DVB) Steering Board approved UHD-1 Phase 2 with an HDR solution that supports HLG and PQ.[6][43] The specification has been published as DVB Bluebook A157 and will be published by the ETSI as TS 101 154 v2.3.1.[6][43]
  • HDMI announced that HLG support had been added to the HDMI 2.0b standard.[11][44][45]

Hardware:

  • Leader Electronics Corporation announced their 12G-SDI waveform monitors with support for HLG.[46]
  • Harmonic Inc. released an update for the ViBE 4K UHD encoder that added support for HLG.[47]
  • Canon Inc. announced that they will release firmware updates for the DP-V2410 and DP-V3010 reference displays to add support for HLG.[48]
  • Sony announced the PVM-X550 OLED monitor with support for HLG.[49] Sony also announced a firmware update for the BVM-X300 OLED monitor to add support for HLG.[49]
  • Sony announced that in October they would release a firmware update to add HLG to their BVM-X300 OLED monitor.[50]
  • Sony announced that their VPL-VW675ES projector would support HLG.[51]
  • The Trusted Reviews website reported that Samsung had told them that all of their 2016 HDR TVs could support HLG with a firmware update.[52]
  • Atomos updated their Shogun Inferno product to include HLG input and output for recording, monitoring, editing and layout from cameras and computers as well as to HLG compatible TVs.[53]

Software:

Broadcasters:

  • Dome Productions announced that they will begin trials of HLG to deliver HDR content.[57]
  • SKY Perfect JSAT Group announced that on October 4 they will start the world's first 4K HDR broadcasts using HLG.[58]
  • Eutelsat announced that it will launch a new channel using HLG.[59]
  • Google announced that YouTube will start streaming HDR videos which can be encoded with HLG or PQ.[60][15]
  • The BBC announced that it was adding a 4-minute HLG edit from their Planet Earth II series to its BBC iPlayer IPTV platform for public UHD testing.[61]
  • Mediapro/Overon announced that they will transmit the Spanish Football League (LFP) worldwide using 4K HDR broadcasts based in HLG

2017

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Industry bodies:

  • ATSC released the video standard for ATSC 3.0 which includes support for HLG.[7]

Hardware:

  • LG Corporation announced that their 2017 Super UHD TVs will support HLG.[62]
  • Panasonic announced that their 2017 OLED TV will support HLG.[63]
  • Sony announced that their 2017 OLED TVs will support HLG.[64]
  • JVC announced that their 2017 4K projectors will support HLG.[65]
  • LG Corporation announced that they will add support for HLG to their 2016 OLED TVs and their 2016 Super UHD TVs with a firmware update.[66]
  • Sony announced that they will add support for HLG to their 2017 4K TVs with a firmware update.[67]
  • Panasonic announced that they will add support for HLG to several models of their 2016 4K TVs with a firmware update.[68]
  • Philips announced that their 2017 4K TVs will support HLG and that they will add support for HLG to several models of their 2016 4K TVs with a firmware update.[69]
  • Sony began releasing firmware updates for several of their 2016 and 2017 Android TV models which adds support for HLG.[70]
  • Panasonic released firmware update 2.0 for the Panasonic Lumix DC-GH5 which added support for HLG recording.[71]
  • Panasonic began releasing firmware updates for several of their 2016 TV models which adds support for HLG.[72]
  • Qualcomm announced the Qualcomm Snapdragon 845 which includes support for HLG.[73]

Software:

Broadcasters:

  • Eutelsat announced that their Hot Bird video service would include the Travelxp 4K channel which uses HLG.[76]
  • The BBC announced that Blue Planet II would be available in 4K HDR on the BBC iPlayer using HLG.[17] Blue Planet II will be available on the BBC iPlayer service from December 10, 2017 to January 16, 2018.[77] The BBC states that almost 400 TV models have support for HLG which includes TV models from Finlux, Hisense, Hitachi, LG, Panasonic, Philips, Samsung, Sony, and Toshiba.[17][77]
  • DirecTV began broadcasting HLG HDR on their 4K Channels 104 and 106.[18][19]

2018

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  • Vizio announced HLG support for their 2018 models.[78]

2019

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  • Panasonic announced HLG support in their S1 and S1R full frame mirrorless cameras which will be released in March 2019.[79]

2020

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  • Sky UK announced that their popular Sky Q box will get HLG support from May 27, 2020.[80]
  • Apple released the iPhone 12 series with HLG video recording support via Dolby Vision profile 8.4, which adds a Dolby Vision metadata layer on top of HLG footage.[81]

See also

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References

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  1. ^ a b c d "High Dynamic Range" (PDF). European Broadcasting Union. Retrieved 2015-11-01.
  2. ^ a b "High Dynamic Range with Hybrid Log–Gamma" (PDF). BBC. Archived (PDF) from the original on 9 November 2018. Retrieved 8 November 2015.
  3. ^ a b c "High Dynamic Range with Hybrid Log–Gamma" (PDF). BBC. Retrieved 2015-11-08.
  4. ^ a b "ARIB STD-B67" (PDF). Association of Radio Industries and Businesses. 2015-07-03. Retrieved 2015-11-01.
  5. ^ a b c d e f "BT.2100 : Image parameter values for high dynamic range television for use in production and international programme exchange". International Telecommunication Union. 2016-07-04. Retrieved 2016-07-04.
  6. ^ a b c "DVB SB Approves UHD HDR Specification". Digital Video Broadcasting. 2016-11-17. Retrieved 2017-01-07.
  7. ^ a b "ATSC Standard: Video" (PDF). Advanced Television Systems Committee. 2017-05-19. Retrieved 2017-05-19.
  8. ^ a b "Ultra HD Forum Guidelines v2.4" (PDF). Ultra HD Forum. 19 October 2020.
  9. ^ a b "ITU-R Report BT.2390 - High dynamic range television for production and international programme exchange". ITU. Retrieved 2021-09-11.
  10. ^ "All you wanted to know about Hybrid Log Gamma (HLG)". TM Broadcast International. 2019-12-23. Retrieved 2020-05-27.
  11. ^ a b "Introducing HDMI 2.0b". HDMI.org. Archived from the original on 2016-12-03. Retrieved 2017-01-07.
  12. ^ a b Rajan Joshi; Shan Liu; Gary Sullivan; Gerhard Tech; Jizheng Xu; Yan Ye (2015-09-05). "HEVC Screen Content Coding Draft Text 4". JCT-VC. Retrieved 2015-11-01.
  13. ^ a b "HDR Video Playback". Android. Retrieved 2016-09-23.
  14. ^ "ITU-T Recommendation H.264 (04/2017)". ITU. 2017-04-13. Retrieved 2017-06-14.
  15. ^ a b "Upload High Dynamic Range (HDR) videos". Google Inc. Retrieved 2017-01-11.
  16. ^ a b Julian Clover (2016-09-23). "Freeview updates for HEVC and Ultra HD". Broadband TV News. Retrieved 2016-09-23.
  17. ^ a b c Leo Kelion (2017-12-05). "Blue Planet II comes to iPlayer in 4K HDR". BBC. Retrieved 2017-12-05.
  18. ^ a b Jason Dachman (2017-12-14). "AT&T DirecTV To Deliver First Live 4K HDR Telecast in U.S. With Tonight's Penguins-Golden Knights Game". Sportsvideo. Retrieved 2018-01-10.
  19. ^ a b Greg Tarr (2017-12-15). "DirecTV Presents NHL 4K Game With Live HDR, But Was Anyone Watching?". HDGuru. Retrieved 2018-01-10.
  20. ^ T. Borer; A. Cotton. "A "Display Independent" High Dynamic Range Television System" (PDF). BBC. Archived (PDF) from the original on 7 February 2016. Retrieved 1 November 2015.
  21. ^ "ARIB STD-B67" (PDF). 3 July 2015. Archived (PDF) from the original on 29 March 2017. Retrieved 8 August 2017.
  22. ^ Morrison, Geoffrey. "What is HLG? Hybrid log gamma. Say what?". CNET. Archived from the original on 7 October 2019. Retrieved 7 October 2019.
  23. ^ St. Leger, Henry. "Hybrid Log Gamma: everything you need to know about HLG HDR". TechRadar. Archived from the original on 7 October 2019. Retrieved 7 October 2019.
  24. ^ "High Dynamic Range Television and Hybrid Log–Gamma". BBC R&D. Archived from the original on 7 October 2019. Retrieved 7 October 2019.
  25. ^ Michael Bizzaco; Ryan Waniata; Simon Cohen (19 December 2020). "HDR TV: What it is and why your next TV should have it". Digital Trends. Designtechnica Corporation. Archived from the original on 21 December 2020. Retrieved 2 January 2021.
  26. ^ a b Ultra HD Forum (19 October 2020). "Ultra HD Forum Guidelines v2.4" (PDF).
  27. ^ a b c d e f g h T. Borer; A. Cotton. "A "Display Independent" High Dynamic Range Television System" (PDF). BBC. Retrieved 2015-11-01.
  28. ^ a b Rajan Joshi; Shan Liu; Gary Sullivan; Gerhard Tech; Ye-Kui Wang; Jizheng Xu; Yan Ye (2016-03-24). "HEVC Screen Content Coding Draft Text 6". JCT-VC. Retrieved 2016-03-26.
  29. ^ a b "Study Group Report High-Dynamic-Range (HDR) Imaging Ecosystem". Society of Motion Picture and Television Engineers. Retrieved 2015-11-30.
  30. ^ a b "ITU announces BT.2100 HDR TV standard". Rasmus Larsen. 2016-07-05. Retrieved 2016-07-26.
  31. ^ Simon Thompson (2015-05-15). "High Dynamic Range at the SES Industry Days". BBC. Retrieved 2015-11-01.
  32. ^ Y. Nishida; T. Yamashita; A. Ichigaya; T. Shimizu (2015-06-09). "Proposed addition of transfer characteristics in VUI". JCT-VC. Retrieved 2015-11-01.
  33. ^ "Sony Describes Hybrid Log Gamma (HLG) at SMPTE 2015 Event". DisplayDaily. Retrieved 2015-11-03.
  34. ^ "SMPTE 2015 Annual Technical Conference & Exhibition". Society of Motion Picture and Television Engineers. Retrieved 2015-11-03.
  35. ^ "Colorfront spotlights amazing UHD HDR performance at SMPTE 2015". American City Business Journals. 2015-10-27. Retrieved 2015-11-01.
  36. ^ Vincent Teoh (2015-11-06). "LG Talk Up 4K OLED TV & HDR at UK Briefing". HDTVtest. Retrieved 2015-11-08.
  37. ^ Chris Forrester (2015-11-04). "SkyPerfect offers UHD-HDR by DTH". Advanced Television. Retrieved 2015-11-04.
  38. ^ Brian Hallett (2015-12-23). "DaVinci Resolve 12.2 Update & Price Drop". Pro Video Coalition. Retrieved 2015-12-23.
  39. ^ "NASA and Harmonic Explore the Boundaries of UHD at ISS Resupply Launch at Kennedy Space Center". CNN. 2015-12-03. Archived from the original on 2015-12-08. Retrieved 2015-12-05.
  40. ^ ""Huge success" for UHD-HLG test in Rome". Advanced Television. 2015-12-14. Retrieved 2015-12-18.
  41. ^ "Ultra HD Forum Releases First Industry Guidelines for Deploying End-to-End Live & Pre-Recorded UHD Services in 2016". Business Wire. 2016-04-18. Retrieved 2016-04-18.
  42. ^ a b "End-to-end guidelines for phase A implementation". Ultra HD Forum. 2016-04-18. Retrieved 2016-04-18.
  43. ^ a b James Grover (2016-11-17). "UHD-1 Phase 2 approved". TVBEurope. Archived from the original on 2017-01-13. Retrieved 2017-01-07.
  44. ^ Ramus Larsen (2016-12-12). "HDMI 2.0b standard gets support for HLG HDR". flatpanelshd. Retrieved 2017-01-07.
  45. ^ Andrew Cotton (2016-12-31). "2016 in Review - High Dynamic Range". BBC. Retrieved 2017-01-07.
  46. ^ "LEADER Announces 12G SDI, HDR and Video over IP Options for its LV 5490 and LV 5480 4K-capable Waveform Monitors". CreativeCOW.net. 2016-01-12. Retrieved 2016-01-13.
  47. ^ "Harmonic Showcases Innovation for Agile Video Delivery at 2016 NAB Show". Yahoo! Finance. 2016-03-29. Retrieved 2016-04-11.
  48. ^ "Canon reveals new camera and lens in advance of NAB". RedShark. 2016-04-13. Retrieved 2016-04-13.
  49. ^ a b "Sony Goes Beyond Definition at NAB 2016". PR Newswire. 2016-04-18. Retrieved 2016-04-18.
  50. ^ Bryant Frazer (2016-08-03). "Sony to Update BVM-X300 4K Monitor in October". studiodaily. Retrieved 2016-08-07.
  51. ^ "Sony Electronics Announces the Latest Addition to its 4K HDR Home Theater Projector Line-Up at CEDIA 2016". PR Newswire. 2016-09-14. Retrieved 2016-09-23.
  52. ^ Steve May (2016-11-04). "Hybrid Log–Gamma: Why it's the next big thing in 4K TV". Trusted Reviews. Retrieved 2017-01-10.
  53. ^ Ogy Stoilov (2016-12-25). "Atomos Shogun Inferno Firmware 8.1 Unlocks Sony FS 2K/Raw Super-Slow Motion". 4K Shooters. Retrieved 2017-01-10.
  54. ^ Wim Van den Broeck (2016-03-11). "How Avid is Advancing Key Industry Trends Highlighted at the HPA Tech Retreat 2016". Avid Technology. Retrieved 2016-04-04.
  55. ^ Bryant Frazer (2016-01-29). "Avid Media Composer 8.5 Adds HDR, Simplifies Menus, Offers Better Feedback on the Timeline". studiodaily. Retrieved 2016-04-04.
  56. ^ Ramus Larsen (2016-09-07). "Android TV 7.0 supports Dolby Vision, HDR10 and HLG". flatpanelshd. Retrieved 2016-09-23.
  57. ^ "Dome Productions to Begin Trialing of HLG for Delivering HDR". Yahoo! Finance. 2016-04-15. Retrieved 2016-04-15.
  58. ^ Colin Mann (2016-07-29). "4K HDR from SKY Perfect JSAT". Advanced Television. Retrieved 2016-07-30.
  59. ^ "IBC 2016: Eutelsat fast forwards in the video age". Eutelsat. 2016-09-07. Retrieved 2016-09-07.
  60. ^ Steven Robertson (2016-11-07). "True colors: adding support for HDR videos on YouTube". Retrieved 2017-01-11.
  61. ^ Dave Bevan (2016-12-08). "BBC announces arrival of HLG content on its iPlayer IPTV platform". BBC. Retrieved 2016-12-08.
  62. ^ John Archer (2017-01-03). "LG Takes Aim At Samsung With New 'Quantum Dot-Beating' TV Technology". Forbes. Retrieved 2017-01-07.
  63. ^ Matt Burgess (2017-01-04). "Panasonic launches 'world's first' HDR, ultra-HD OLED TV". Wired. Retrieved 2017-01-07.
  64. ^ John Archer (2017-01-04). "Sony Unveils Debut OLED TV Range". Forbes. Retrieved 2017-01-07.
  65. ^ "New JVC 4K e-Shift4 Projectors Deliver Higher Brightness and Contrast, Add Low Latency Mode". JVC. 2017-01-05. Retrieved 2017-01-16.
  66. ^ Ramus Larsen (2017-01-04). "LG will bring HLG HDR to 2016 OLED & LCDs through firmware update". flatpanelshd. Retrieved 2017-01-07.
  67. ^ Ramus Larsen (2017-01-16). "Sony: Android TV 7.0 coming to 2017, 2016 & 2015 TVs". flatpanelshd. Retrieved 2017-01-16.
  68. ^ Ramus Larsen (2017-02-17). "Panasonic will add HLG HDR support to select 2016 TVs". flatpanelshd. Retrieved 2017-03-04.
  69. ^ Ramus Larsen (2017-03-13). "Philips: HLG HDR update coming to 2016 TVs". flatpanelshd. Retrieved 2017-03-13.
  70. ^ Ramus Larsen (2017-05-31). "Android 7.0 will roll out to Sony TVs starting May 31". flatpanelshd. Retrieved 2017-05-31.
  71. ^ Daron James (2017-09-28). "Panasonic Releases GH5 Firmware 2.0 with Anamorphic and More". No Film School. Retrieved 2017-12-09.
  72. ^ Ramus Larsen (2017-11-27). "Panasonic releases HLG HDR update for select 2016 TVs". flatpanelshd. Retrieved 2017-12-05.
  73. ^ Bruno Ferreira (2017-12-06). "Qualcomm lifts the veil on the Snapdragon 845 SoC". Tech Report. Retrieved 2017-12-09.
  74. ^ "The Latest (and Greatest!) for Premiere Pro CC and Media Encoder". Adobe Systems. 2017-04-19. Retrieved 2017-04-20.
  75. ^ Brittany Hillen (2017-12-14). "Final Cut Pro X 10.4 adds HDR support, VR video editing, and (finally!) curves". DPReview. Retrieved 2017-12-17.
  76. ^ "Eutelsat scales up Ultra HD content with two new channels at the popular Hotbird neighbourhood". Eutelsat. 2017-01-04. Retrieved 2017-01-14.
  77. ^ a b "How can I watch Blue Planet II in Ultra HD on my connected TV?". BBC. 2017-12-05. Retrieved 2017-12-06.
  78. ^ "Vizio courts cord cutters, challenges OLED, and adds new HDR options to its 2018 smart TV lineup". TechHive. Retrieved 2018-10-26.
  79. ^ "Pansonic S1, S1R to ship in march, HLG photo and high res mode added to feature list". DpReview news. Retrieved 2019-01-10.
  80. ^ "Sky Q will finally get HDR on Wednesday 27 May 2020". Pocket Lint News. Retrieved 2020-05-25.
  81. ^ Patel, Nilay (2020-10-20). "Apple iPhone 12 Pro review: ahead of its time". The Verge. Retrieved 2020-10-20.
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