Hybrid log–gamma

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.{{cite news|author=T. Borer|first=|author2=A. Cotton|date=|title=A "Display Independent" High Dynamic Range Television System|work=|publisher=BBC|url=https://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP309.pdf|url-status=live|access-date=1 November 2015|archive-url=https://web.archive.org/web/20160207193353/https://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP309.pdf|archive-date=7 February 2016}}{{Cite web |last= |first= |date=3 July 2015 |title=ARIB STD-B67 |url=http://www.arib.or.jp/english/html/overview/doc/2-STD-B67v1_0.pdf |url-status=live |archive-url=https://web.archive.org/web/20170329122104/http://www.arib.or.jp/english/html/overview/doc/2-STD-B67v1_0.pdf |archive-date=29 March 2017 |access-date=8 August 2017}} 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.{{Cite web|last=Morrison|first=Geoffrey|title=What is HLG? Hybrid log gamma. Say what?|url=https://www.cnet.com/news/all-about-hlg-what-hybrid-log-gamma-means-for-your-tv/|url-status=live|archive-url=https://web.archive.org/web/20191007204408/https://www.cnet.com/news/all-about-hlg-what-hybrid-log-gamma-means-for-your-tv/|archive-date=7 October 2019|access-date=7 October 2019|website=CNET|language=en}}{{Cite web|last=St. Leger|first=Henry|title=Hybrid Log Gamma: everything you need to know about HLG HDR|url=https://www.techradar.com/news/hybrid-log-gamma-what-you-need-to-know-about-hlg|url-status=live|archive-url=https://web.archive.org/web/20191007184226/https://www.techradar.com/news/hybrid-log-gamma-what-you-need-to-know-about-hlg|archive-date=7 October 2019|access-date=7 October 2019|website=TechRadar|language=en}}{{Cite web|title=High Dynamic Range Television and Hybrid Log–Gamma|url=https://www.bbc.co.uk/rd/projects/high-dynamic-range|url-status=live|archive-url=https://web.archive.org/web/20191007185732/https://www.bbc.co.uk/rd/projects/high-dynamic-range|archive-date=7 October 2019|access-date=7 October 2019|website=BBC R&D}} In contrast with the other HDR formats it does not use metadata.{{cite web|author1=Michael Bizzaco|author2=Ryan Waniata|author3=Simon Cohen|date=19 December 2020|title=HDR TV: What it is and why your next TV should have it|url=https://www.digitaltrends.com/home-theater/what-is-hdr-tv/|url-status=live|archive-url=https://web.archive.org/web/20201221081838/https://www.digitaltrends.com/home-theater/what-is-hdr-tv/|archive-date=21 December 2020|access-date=2 January 2021|website=Digital Trends|publisher=Designtechnica Corporation}}

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.{{Cite web|last=Ultra HD Forum|date=19 October 2020|title=Ultra HD Forum Guidelines v2.4|url=https://ultrahdforum.org/wp-content/uploads/UHD-Guidelines-V2.4-Fall2020-1.pdf|archive-url=|archive-date=|access-date=|website=}} HLG is therefore backward compatible with SDR-UHDTV and will show color distortion on common SDR devices that only support Rec. 709 color primaries.

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.{{cite news |title=A "Display Independent" High Dynamic Range Television System |author=T. Borer |author2=A. Cotton |publisher=BBC |url=http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP309.pdf |accessdate=2015-11-01}}

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

$$E\text{'}=\backslash begin\{cases\}$$

r \, \sqrt{E}\ & 0 \le E \le 1,\!\\

a \ln(E - b) + c & 1 < E

\end{cases}

or as follows (as defined in Rec. 2100):

$$E\text{'}=\backslash begin\{cases\}$$

\sqrt{3E}\ & 0 \le E \le \frac{1}{12} ,\!\\

a \ln(12E - b) + c & \frac{1}{12} < E \le 1

\end{cases}

where

• E is the linear light signal normalized by the reference white level in the range $\backslash left[0,\; 12\; \backslash right]$ in ARIB STD-B67 and in the range $\backslash left[0,\; 1\; \backslash right]$ 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. ARIB STD-B67 has a nominal range of 0 to 12.{{cite news |title=HEVC Screen Content Coding Draft Text 6 |author=Rajan Joshi |author2=Shan Liu |author3=Gary Sullivan |author4=Gerhard Tech |author5=Ye-Kui Wang |author6=Jizheng Xu |author7=Yan Ye |publisher=JCT-VC |url=http://phenix.it-sudparis.eu/jct/doc_end_user/current_document.php?id=10481 |date=2016-03-24 |accessdate=2016-03-26}} HLG uses a logarithmic curve for the upper half of the signal values due to Weber's law.

HLG reference OOTF is as follows:

$$\backslash begin\{cases\}$$

F_D = OOTF[E]= \alpha Y_S^{\gamma-1} E \!\\

R_D = \alpha Y_S^{\gamma-1} R_S \!\\

G_D = \alpha Y_S^{\gamma-1} G_S \!\\

B_D = \alpha Y_S^{\gamma-1} B_S \!\\

Y_S = 0.2627 R_S + 0.6780 G_S + 0.0593 B_S

\end{cases}

where

• $F\_D$ is the luminance of a displayed linear component $R\_D,\; G\_D,\; B\_D$ in cd/m².
• $E$ is a signal for each colour component {Rs, Gs, Bs} proportional to scene linear light normalized to the range $\backslash left[0,\; 1\; \backslash right]$.
• $Y\_S$ is the normalized linear scene luminance.
• $\backslash alpha$ is the variable for user gain in cd/m². It represents LW, the nominal peak luminance of a display for achromatic pixels.
• $\backslash gamma$ is the system gamma. $\backslash gamma$ = 1.2 at the nominal display peak luminance of 1000 cd/m².

HLG reference EOTF is as follows:

$F\_D\; =\; OOTF[OETF^\{-1\}[max(0,(1-\backslash beta)E\text{'}\; +\; \backslash beta\; )]]$

where

• $F\_D$ is the luminance of a displayed linear component $R\_D,\; G\_D,\; B\_D$ in cd/m².
• $E\text{'}$ is the non-linear electrical signal $R\text{'},\; G\text{'},\; B\text{'}$ in the range $\backslash left[0,\; 1\; \backslash right]$.
• $\backslash beta\; =\; \backslash sqrt\{\; 3\; (L\_B\; /\; L\_W)^\{1/\backslash gamma\}\; \}$ is the variable for user black level lift.
• $L\_W$ is nominal peak luminance of the display in cd/m² for achromatic pixels.
• $L\_B$ 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. HLG can be used with displays of different brightness in a wide range of viewing environments.

The dynamic range that can be perceived by the human eye in a single image is around 14 stops. 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. Professional SDR video displays with a bit depth of 10-bits per sample extend that range to about 10 stops. 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.

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. HLG also increases the dynamic range by not including the linear part of the conventional gamma curve used by Rec. 601 and Rec. 709.{{cite news |title=Study Group Report High-Dynamic-Range (HDR) Imaging Ecosystem |publisher=Society of Motion Picture and Television Engineers |url=https://www.smpte.org/standards/reports |accessdate=2015-11-30}} 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.

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.{{cite news |title=ITU announces BT.2100 HDR TV standard |publisher=Rasmus Larsen |url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1467719709 |date=2016-07-05 |accessdate=2016-07-26}}

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:

$$V=\backslash begin\{cases\}$$

\sqrt{3} \cdot L_c^{0.5} & \frac{1}{12} \ge L_c \ge 0,\!\\

a \cdot \ln(12L_c - b) + c & 1 \ge L_c > \frac{1}{12}

\end{cases}

where

• L_c 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

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).{{cite news |title=High Dynamic Range at the SES Industry Days |author=Simon Thompson |publisher=BBC |url=https://www.bbc.co.uk/rd/blog/2015/05/high-dynamic-range-at-the-ses-industry-days |date=2015-05-15 |accessdate=2015-11-01}} 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.{{cite news |title=Proposed addition of transfer characteristics in VUI |author=Y. Nishida |author2=T. Yamashita |author3=A. Ichigaya |author4=T. Shimizu |publisher=JCT-VC |url=http://phenix.it-sudparis.eu/jct/doc_end_user/current_document.php?id=10036 |date=2015-06-09 |accessdate=2015-11-01}}

Later that year, Sony showed HLG video on a modified HDR display at the SMPTE 2015 conference.{{cite news |title=Sony Describes Hybrid Log Gamma (HLG) at SMPTE 2015 Event |publisher=DisplayDaily |url=http://www.displaydaily.com/content/videos/32323-sony-describes-hybrid-log-gamma-hlg-at-smpte-2015-event-sony-describes-hybrid-log-gamma-hlg-at-smpte-2015-event |accessdate=2015-11-03}}{{cite news |title=SMPTE 2015 Annual Technical Conference & Exhibition |publisher=Society of Motion Picture and Television Engineers |url=https://www.smpte.org/ATC |accessdate=2015-11-03}} Colorfront announced that their Transkoder 2016 software would support HDR output using HLG.{{cite news |title=Colorfront spotlights amazing UHD HDR performance at SMPTE 2015 |publisher=American City Business Journals |url=http://www.bizjournals.com/prnewswire/press_releases/2015/10/27/MN39583 |date=2015-10-27 |accessdate=2015-11-01}} LG announced that their 2015 4K OLED TVs would support HDR from HLG and perceptual quantizer (PQ).{{cite news|author=Vincent Teoh|date=2015-11-06|title=LG Talk Up 4K OLED TV & HDR at UK Briefing|publisher=HDTVtest|url=http://www.hdtvtest.co.uk/news/lg-4k-hdr-201511064202.htm|accessdate=2015-11-08}} 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.{{cite news |title=SkyPerfect offers UHD-HDR by DTH |author=Chris Forrester |publisher=Advanced Television |url=http://advanced-television.com/2015/11/04/skyperfect-offers-uhd-hdr-by-dth/ |date=2015-11-04 |accessdate=2015-11-04}}{{cite news|author=Brian Hallett|date=2015-12-23|title=DaVinci Resolve 12.2 Update & Price Drop|publisher=Pro Video Coalition|url=http://www.provideocoalition.com/davinci-resolve-12-2-update-price-drop|accessdate=2015-12-23}} Harmonic Inc. and NASA announced the HDR capture of an Atlas V launch which was broadcast the next day on NASA TV using HLG.{{cite news|title=NASA and Harmonic Explore the Boundaries of UHD at ISS Resupply Launch at Kennedy Space Center |publisher=CNN |url=https://money.cnn.com/news/newsfeeds/articles/marketwire/11G074496-001.htm |date=2015-12-03 |accessdate=2015-12-05 |url-status=dead |archiveurl=https://web.archive.org/web/20151208170158/http://money.cnn.com/news/newsfeeds/articles/marketwire/11G074496-001.htm |archivedate=2015-12-08 }} Vatican Television Center broadcast the ceremony of the Holy Door using HLG and the Rec. 2020 color space.{{cite news |title="Huge success" for UHD-HLG test in Rome |publisher=Advanced Television |url=http://advanced-television.com/2015/12/14/huge-success-for-uhd-hlg-test-in-rome/ |date=2015-12-14 |accessdate=2015-12-18}}

Industry bodies:

• The Ultra HD Forum announced their guidelines for UHD Phase A which includes support for HLG.{{cite news|date=2016-04-18|title=Ultra HD Forum Releases First Industry Guidelines for Deploying End-to-End Live & Pre-Recorded UHD Services in 2016|publisher=Business Wire|url=http://www.businesswire.com/news/home/20160418006415/en/Ultra-HD-Forum-Releases-Industry-Guidelines-Deploying|accessdate=2016-04-18}}{{cite news|date=2016-04-18|title=End-to-end guidelines for phase A implementation|publisher=Ultra HD Forum|url=http://ultrahdforum.org/resources/phasea-guidelines-description/|accessdate=2016-04-18}} The Ultra HD Forum also defined HLG with a bit depth of 10-bits, and the Rec. 2020 color space.
• The ITU announced Rec. 2100 which defines two HDR transfer functions which are HLG and PQ.
• Digital UK published their 2017 specification for Freeview Play which includes support for HDR using HLG.
• The Digital Video Broadcasting (DVB) Steering Board approved UHD-1 Phase 2 with an HDR solution that supports HLG and PQ.{{cite news|author=James Grover|date=2016-11-17|title=UHD-1 Phase 2 approved|publisher=TVBEurope|url=http://www.tvbeurope.com/uhd-1-phase-2-approved/|accessdate=2017-01-07|archive-date=2017-01-13|archive-url=https://web.archive.org/web/20170113023123/http://www.tvbeurope.com/uhd-1-phase-2-approved/|url-status=dead}} The specification has been published as DVB Bluebook A157 and will be published by the ETSI as TS 101 154 v2.3.1.
• HDMI announced that HLG support had been added to the HDMI 2.0b standard.{{cite news|author=Ramus Larsen|date=2016-12-12|title=HDMI 2.0b standard gets support for HLG HDR|publisher=flatpanelshd|url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1481526782|accessdate=2017-01-07}}{{cite news|author=Andrew Cotton|date=2016-12-31|title=2016 in Review - High Dynamic Range|publisher=BBC|url=https://www.bbc.co.uk/rd/blog/2016-12-bbc-high-dynamic-range-2016|accessdate=2017-01-07}}

Hardware:

• Leader Electronics Corporation announced their 12G-SDI waveform monitors with support for HLG.{{cite news |title=LEADER Announces 12G SDI, HDR and Video over IP Options for its LV 5490 and LV 5480 4K-capable Waveform Monitors |publisher=CreativeCOW.net |url=https://news.creativecow.net/story/880513 |date=2016-01-12 |accessdate=2016-01-13}}
• Harmonic Inc. released an update for the ViBE 4K UHD encoder that added support for HLG.{{cite news |title=Harmonic Showcases Innovation for Agile Video Delivery at 2016 NAB Show |publisher=Yahoo! Finance |url=https://finance.yahoo.com/news/harmonic-showcases-innovation-agile-video-120000331.html |date=2016-03-29 |accessdate=2016-04-11}}
• Canon Inc. announced that they will release firmware updates for the DP-V2410 and DP-V3010 reference displays to add support for HLG.{{cite news |title=Canon reveals new camera and lens in advance of NAB |publisher=RedShark |url=http://www.redsharknews.com/production/item/3386-canon-reveals-new-camera-and-lens-in-advance-of-nab |date=2016-04-13 |accessdate=2016-04-13}}
• Sony announced the PVM-X550 OLED monitor with support for HLG.{{cite news |title=Sony Goes Beyond Definition at NAB 2016 |publisher=PR Newswire |url=http://www.prnewswire.com/news-releases/sony-goes-beyond-definition-at-nab-2016-300252643.html |date=2016-04-18 |accessdate=2016-04-18}} Sony also announced a firmware update for the BVM-X300 OLED monitor to add support for HLG.
• Sony announced that in October they would release a firmware update to add HLG to their BVM-X300 OLED monitor.{{cite news |title=Sony to Update BVM-X300 4K Monitor in October |author=Bryant Frazer |publisher=studiodaily |url=http://www.studiodaily.com/2016/08/sony-to-update-bvm-x300-4k-monitor-in-october/ |date=2016-08-03 |accessdate=2016-08-07}}
• Sony announced that their VPL-VW675ES projector would support HLG.{{cite news |title=Sony Electronics Announces the Latest Addition to its 4K HDR Home Theater Projector Line-Up at CEDIA 2016 |publisher=PR Newswire |url=http://www.prnewswire.com/news-releases/sony-electronics-announces-the-latest-addition-to-its-4k-hdr-home-theater-projector-line-up-at-cedia-2016-300327954.html |date=2016-09-14 |accessdate=2016-09-23}}
• The Trusted Reviews website reported that Samsung had told them that all of their 2016 HDR TVs could support HLG with a firmware update.{{cite news |title=Hybrid Log–Gamma: Why it's the next big thing in 4K TV |author=Steve May |publisher=Trusted Reviews |url=http://www.trustedreviews.com/opinions/hybrid-log-gamma-what-is-it |date=2016-11-04 |accessdate=2017-01-10}}
• 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.{{cite news |title=Atomos Shogun Inferno Firmware 8.1 Unlocks Sony FS 2K/Raw Super-Slow Motion |author=Ogy Stoilov|publisher=4K Shooters |url=http://www.4kshooters.net/2016/12/25/atomos-shogun-inferno-firmware-8-1-unlocks-sony-fs-2kraw-super-slow-motion/ |date=2016-12-25 |accessdate=2017-01-10}}

Software:

• Avid Technology released an update for Media Composer that added support for HLG.{{cite news |title=How Avid is Advancing Key Industry Trends Highlighted at the HPA Tech Retreat 2016 |author=Wim Van den Broeck |publisher=Avid Technology |url=http://www.avidblogs.com/how-avid-is-advancing-key-industry-trends-highlighted-at-the-hpa-tech-retreat-2016/ |date=2016-03-11 |accessdate=2016-04-04}}{{cite news |title=Avid Media Composer 8.5 Adds HDR, Simplifies Menus, Offers Better Feedback on the Timeline |author=Bryant Frazer |publisher=studiodaily |url=http://www.studiodaily.com/2016/01/avid-media-composer-8-5-adds-hdr-simplifies-menus-offers-better-feedback-on-the-timeline/ |date=2016-01-29 |accessdate=2016-04-04}}
• Google announced Android TV 7.0 which supports HLG.{{cite news |title=Android TV 7.0 supports Dolby Vision, HDR10 and HLG |author=Ramus Larsen |publisher=flatpanelshd |url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1473405995 |date=2016-09-07 |accessdate=2016-09-23}}

Broadcasters:

• Dome Productions announced that they will begin trials of HLG to deliver HDR content.{{cite news |title=Dome Productions to Begin Trialing of HLG for Delivering HDR |publisher=Yahoo! Finance |url=https://ca.finance.yahoo.com/news/dome-productions-begin-trialing-hlg-171500211.html |date=2016-04-15 |accessdate=2016-04-15}}
• SKY Perfect JSAT Group announced that on October 4 they will start the world's first 4K HDR broadcasts using HLG.{{cite news |title=4K HDR from SKY Perfect JSAT |author=Colin Mann |publisher=Advanced Television |url=http://advanced-television.com/2016/07/29/4k-hdr-from-sky-perfect-jsat/ |date=2016-07-29 |accessdate=2016-07-30}}
• Eutelsat announced that it will launch a new channel using HLG.{{cite news |title=IBC 2016: Eutelsat fast forwards in the video age |publisher=Eutelsat |url=http://news.eutelsat.com/pressreleases/ibc-2016-eutelsat-fast-forwards-in-the-video-age-1549968 |date=2016-09-07 |accessdate=2016-09-07}}
• Google announced that YouTube will start streaming HDR videos which can be encoded with HLG or PQ.{{cite news |title=True colors: adding support for HDR videos on YouTube |author=Steven Robertson |url=https://youtube.googleblog.com/2016/11/true-colors-adding-support-for-hdr.html |date=2016-11-07 |accessdate=2017-01-11}}
• 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.{{cite news|title=BBC announces arrival of HLG content on its iPlayer IPTV platform|author=Dave Bevan|date=2016-12-08|accessdate=2016-12-08|publisher=BBC|url=https://www.bbc.co.uk/mediacentre/latestnews/2016/planet-earth-2-uhd}}
• Mediapro/Overon announced that they will transmit the Spanish Football League (LFP) worldwide using 4K HDR broadcasts based in HLG

Industry bodies:

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

Hardware:

• LG Corporation announced that their 2017 Super UHD TVs will support HLG.{{cite news |title=LG Takes Aim At Samsung With New 'Quantum Dot-Beating' TV Technology |author=John Archer |work=Forbes |url=https://www.forbes.com/sites/johnarcher/2017/01/03/lg-takes-aim-at-samsung-with-new-quantum-dot-beating-tv-technology/ |date=2017-01-03 |accessdate=2017-01-07}}
• Panasonic announced that their 2017 OLED TV will support HLG.{{cite news |title=Panasonic launches 'world's first' HDR, ultra-HD OLED TV |author=Matt Burgess |publisher=Wired |url=https://www.wired.co.uk/article/panasonic-ez1002-television-4k-hdr-ultra-hdr |date=2017-01-04 |accessdate=2017-01-07}}
• Sony announced that their 2017 OLED TVs will support HLG.{{cite news |title=Sony Unveils Debut OLED TV Range |author=John Archer |work=Forbes |url=https://www.forbes.com/sites/johnarcher/2017/01/04/sony-unveils-debut-oled-tv-range/ |date=2017-01-04 |accessdate=2017-01-07}}
• JVC announced that their 2017 4K projectors will support HLG.{{cite news |title=New JVC 4K e-Shift4 Projectors Deliver Higher Brightness and Contrast, Add Low Latency Mode |publisher=JVC |url=http://pro.jvc.com/pro/pr/2017/ces/CES17_new_eshift4_projectors.html |date=2017-01-05 |accessdate=2017-01-16}}
• 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.{{cite news |title=LG will bring HLG HDR to 2016 OLED & LCDs through firmware update |author=Ramus Larsen |publisher=flatpanelshd |url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1484051855 |date=2017-01-04 |accessdate=2017-01-07}}
• Sony announced that they will add support for HLG to their 2017 4K TVs with a firmware update.{{cite news |title=Sony: Android TV 7.0 coming to 2017, 2016 & 2015 TVs |author=Ramus Larsen |publisher=flatpanelshd |url=https://www.flatpanelshd.com/news.php?subaction=showfull&id=1484553703 |date=2017-01-16 |accessdate=2017-01-16}}
• Panasonic announced that they will add support for HLG to several models of their 2016 4K TVs with a firmware update.{{cite news |title=Panasonic will add HLG HDR support to select 2016 TVs |author=Ramus Larsen |publisher=flatpanelshd |url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1487319665 |date=2017-02-17 |accessdate=2017-03-04}}
• 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.{{cite news |title=Philips: HLG HDR update coming to 2016 TVs |author=Ramus Larsen |publisher=flatpanelshd |url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1489426063 |date=2017-03-13 |accessdate=2017-03-13}}
• Sony began releasing firmware updates for several of their 2016 and 2017 Android TV models which adds support for HLG.{{cite news |title=Android 7.0 will roll out to Sony TVs starting May 31 |author=Ramus Larsen |publisher=flatpanelshd |url=http://www.flatpanelshd.com/news.php?subaction=showfull&id=1496115817 |date=2017-05-31 |accessdate=2017-05-31}}
• Panasonic released firmware update 2.0 for the Panasonic Lumix DC-GH5 which added support for HLG recording.{{cite news |title=Panasonic Releases GH5 Firmware 2.0 with Anamorphic and More |author=Daron James |publisher=No Film School |url=https://nofilmschool.com/2017/09/panasonic-gh5-adds-anamorphic-and-more-firmware-update |date=2017-09-28 |accessdate=2017-12-09}}
• Panasonic began releasing firmware updates for several of their 2016 TV models which adds support for HLG.{{cite news |title=Panasonic releases HLG HDR update for select 2016 TVs |author=Ramus Larsen |publisher=flatpanelshd |url=https://www.flatpanelshd.com/news.php?subaction=showfull&id=1511781178 |date=2017-11-27 |accessdate=2017-12-05}}
• Qualcomm announced the Qualcomm Snapdragon 845 which includes support for HLG.{{cite news |title=Qualcomm lifts the veil on the Snapdragon 845 SoC |publisher=Tech Report |author=Bruno Ferreira |url=https://techreport.com/news/32933/qualcomm-lifts-the-veil-on-the-snapdragon-845-soc |date=2017-12-06 |accessdate=2017-12-09}}

Software:

• Adobe Systems announced updates to Adobe Creative Cloud which includes support for HLG.{{cite news |title=The Latest (and Greatest!) for Premiere Pro CC and Media Encoder |publisher=Adobe Systems |url=https://blogs.adobe.com/creativecloud/the-latest-and-greatest-for-premiere-pro-cc-and-media-encoder/ |date=2017-04-19 |accessdate=2017-04-20}}
• Apple released a firmware update for Final Cut Pro X which includes support for HLG.{{cite news |title=Final Cut Pro X 10.4 adds HDR support, VR video editing, and (finally!) curves |publisher=DPReview |author=Brittany Hillen |url=https://www.dpreview.com/news/0999542997/final-cut-pro-x-10-4-adds-hdr-support-vr-video-editing-and-finally-curves |date=2017-12-14 |accessdate=2017-12-17}}

Broadcasters:

• Eutelsat announced that their Hot Bird video service would include the Travelxp 4K channel which uses HLG.{{cite news |title=Eutelsat scales up Ultra HD content with two new channels at the popular Hotbird neighbourhood |publisher=Eutelsat |url=http://news.eutelsat.com/pressreleases/eutelsat-scales-up-ultra-hd-content-with-two-new-channels-at-the-popular-hotbird-neighbourhood-1721477 |date=2017-01-04 |accessdate=2017-01-14}}
• The BBC announced that Blue Planet II would be available in 4K HDR on the BBC iPlayer using HLG. Blue Planet II will be available on the BBC iPlayer service from December 10, 2017 to January 16, 2018.{{cite news |title=How can I watch Blue Planet II in Ultra HD on my connected TV? |publisher=BBC |url=https://www.bbc.co.uk/iplayer/help/latest-news/blue-planet-II-uhd |date=2017-12-05 |accessdate=2017-12-06}} 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.
• DirecTV began broadcasting HLG HDR on their 4K Channels 104 and 106.

• Vizio announced HLG support for their 2018 models.{{Cite news|url=https://www.techhive.com/article/3268764/smart-tv/vizio-courts-cord-cutters-challenges-oled-and-adds-new-hdr-options-to-its-2018-smart-tv-lineup.html|title=Vizio courts cord cutters, challenges OLED, and adds new HDR options to its 2018 smart TV lineup|work=TechHive|access-date=2018-10-26|language=en}}

• Panasonic announced HLG support in their S1 and S1R full frame mirrorless cameras which will be released in March 2019.{{Cite news|url=https://www.dpreview.com/news/7318697757/panasonic-s1-s1r-to-ship-in-march-hlg-photo-and-high-res-mode-added-to-feature-list|title=Pansonic S1, S1R to ship in march, HLG photo and high res mode added to feature list|work=DpReview news|access-date=2019-01-10|language=en}}

• Sky UK announced that their popular Sky Q box will get HLG support from May 27, 2020.{{Cite news|url=https://www.pocket-lint.com/tv/news/sky/152314-sky-q-will-finally-get-hdr-on-wednesday-23-may-2020.amphtml|title=Sky Q will finally get HDR on Wednesday 27 May 2020|work=Pocket Lint News|access-date=2020-05-25|language=en}}
• 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.{{Cite web|last=Patel|first=Nilay|date=2020-10-20|title=Apple iPhone 12 Pro review: ahead of its time|url=https://www.theverge.com/21524288/apple-iphone-12-pro-review|access-date=2020-10-20|website=The Verge|language=en}}

• Dynamic range
• Gamma correction
• High-dynamic-range rendering
• High-dynamic-range imaging
• High-dynamic-range video

{{Reflist}}

• [http://www.arib.or.jp/english/html/overview/doc/2-STD-B67v1_0.pdf ARIB STD-B67]
• T. Borer and A. Cotton, [http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP309.pdf A "Display Independent" High Dynamic Range Television System], BBC Research & Development White Paper WHP 309, September 2015

{{Dynamic range color representation}}

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Category:High dynamic range

Category:Television technology