Editing Channel 4 (section)

==Channel 4 HD==
[[File:Channel 4HD Logo.svg|thumb|upright=0.75|Channel 4 HD logo (2007–2015)]]
<!-- Deleted image removed: [[File:Channel 4 HD trail example.png|thumb|upright=0.75|Trail boards to promote Channel 4 HD.]] -->
In mid-2006, Channel 4 ran a six-month closed trial of [[HDTV]], as part of the wider [[Digital television in the United Kingdom#Freeview HD|Freeview HD]] experiment via the [[Crystal Palace transmitter]] to London and parts of the [[home counties]],<ref>{{cite web |url=http://www.ofcom.org.uk/consult/condocs/ddr/ddr_annexed.pdf |title=Digital Dividend Review Annexes |website=Ofcom |archiveurl=https://web.archive.org/web/20070615192453/http://www.ofcom.org.uk/consult/condocs/ddr/ddr_annexed.pdf |archivedate=15 June 2007 }}</ref> including the use of [[Lost (2004 TV series)|''Lost'']] and ''[[Desperate Housewives]]'' as part of the experiment, as US broadcasters such as [[American Broadcasting Company|ABC]] already have an HDTV back catalogue.

On 10 December 2007, Channel 4 launched a high-definition television [[simulcast]] of Channel 4 on [[Sky+ HD|Sky]]'s digital satellite platform, after Sky agreed to contribute toward the channel's satellite distribution costs. It was the first full-time [[High-definition television|high-definition]] channel from a terrestrial UK broadcaster.<ref>{{cite web|url=http://www.dtg.org.uk/dtg/press_releases/dtg_nmm_20100318.pdf|title=BBC HD strategy comes into focus as Five opts for BSkyB, not Freeview|publisher=New Media Markets|date=18 March 2010|access-date=28 April 2010|archive-url=https://web.archive.org/web/20110722130613/http://www.dtg.org.uk/dtg/press_releases/dtg_nmm_20100318.pdf|archive-date=22 July 2011|url-status=dead}}</ref>

On 31 July 2009, Virgin Media added Channel 4 HD on channel 146 (later on channel 142, now on channel 141) as part of the M pack.<ref>{{cite web|url=https://www.digitalspy.com/tech/cable/a168390/c4-hd-coming-to-virgin-media-tomorrow/|title=C4 HD coming to Virgin Media tomorrow|website=Digital Spy|date=30 July 2009|access-date=8 June 2022|archive-date=15 October 2015|archive-url=https://web.archive.org/web/20151015213407/http://www.digitalspy.co.uk/tech/news/a168390/c4-hd-coming-to-virgin-media-tomorrow.html|url-status=live}}</ref> On 25 March 2010, Channel 4 HD appeared on [[Freeview (UK)|Freeview]] channel 52 with a placeholding caption, ahead of a commercial launch on 30 March 2010, coinciding with the commercial launch of Freeview HD.<ref>{{cite web|url=https://www.digitalspy.com/tech/terrestrial/a210797/c4-hd-begins-freeview-test-transmissions/|title=C4 HD begins Freeview test transmissions|website=Digital Spy|date=26 March 2010|access-date=8 June 2022|archive-date=15 October 2015|archive-url=https://web.archive.org/web/20151015213407/http://www.digitalspy.co.uk/tech/news/a210797/c4-hd-begins-freeview-test-transmissions.html|url-status=live}}</ref><ref>{{cite web|url=http://www.reghardware.com/2010/03/30/freeview_hd_launches_gets_channel_4/|title=Freeview HD launches, gets Channel 4|publisher=Register Hardware|date=30 March 2010|access-date=10 February 2013|archive-url=https://web.archive.org/web/20130116072206/http://www.reghardware.com/2010/03/30/freeview_hd_launches_gets_channel_4/|archive-date=16 January 2013|url-status=dead}}</ref> On 19 April 2011, Channel 4 HD was added to [[Freesat]] on channel 126.<ref>{{cite web|url=http://www.joinfreesat.co.uk/channel-4-hd-finally-arrives-on-freesat/|title=Channel 4 HD Finally Arrives on Freesat|publisher=Join Freesat|date=19 April 2011|access-date=10 February 2013|archive-date=16 November 2018|archive-url=https://web.archive.org/web/20181116041211/http://www.joinfreesat.co.uk/channel-4-hd-finally-arrives-on-freesat/|url-status=live}}</ref> As a consequence, the channel moved from being [[free-to-view]] to [[free-to-air]] on satellite during March 2011. With the closure of [[S4C Clirlun]] in Wales on 1 December 2012, on Freeview, Channel 4 HD launched in Wales on 2 December 2012.<ref>{{cite web|url=http://stakeholders.ofcom.org.uk/binaries/spectrum/spectrum-policy-area/projects/dtv/Amendment_to_Determination.pdf|title=Amendment to Determination|date=21 September 2012|website=Ofcom|access-date=2 October 2012|archive-date=30 April 2013|archive-url=https://web.archive.org/web/20130430143005/http://stakeholders.ofcom.org.uk/binaries/spectrum/spectrum-policy-area/projects/dtv/Amendment_to_Determination.pdf|url-status=live}}</ref>

The channel carries the same schedule as Channel 4, broadcasting programmes in HD when available, acting as a simulcast. Therefore, SD programming is broadcast upscaled to HD. The first true HD programme to be shown was the 1996 [[Adam Sandler]] film ''[[Happy Gilmore]]''. From launch until 2016 the presence of the 4HD logo on screen denoted true HD content.

On 1 July 2014, Channel 4 +1 HD, an HD simulcast of Channel 4 +1, launched on Freeview channel 110. It closed on 22 June 2020 to help make room on COM7 following the closure of COM8 on Freeview. [[4seven|4Seven HD]] were removed from Freeview also.<ref>{{cite web|url=https://www.freeview.co.uk/help/22-jun-2020-channel-broadcast-changes|title=Channel Broadcast Changes|date=22 June 2020|website=Freesat|access-date=29 June 2020|archive-date=2 July 2020|archive-url=https://web.archive.org/web/20200702234843/https://www.freeview.co.uk/help/22-jun-2020-channel-broadcast-changes|url-status=live}}</ref>
 
On 20 February 2018, Channel 4 announced that Channel 4 HD and All 4 would no longer be supplied on Freesat from 22 February 2018.<ref>{{cite web|url=https://www.freesat.co.uk/news/all4-4hd-leave-freesat/|title=C4 HD and All4 to leave Freesat|date=20 February 2018|website=Freesat|access-date=20 February 2018|archive-date=20 February 2018|archive-url=https://web.archive.org/web/20180220143353/https://www.freesat.co.uk/news/all4-4hd-leave-freesat/|url-status=live}}</ref> Channel 4 HD returned to the platform on 8 December 2021, along with the music channel portfolio of [[The Box Plus Network]].<ref>{{cite web|url=https://www.cordbusters.co.uk/freesat-channel-4-hd-music-channels/|title=Freesat Gets 6 New Channels, Including Channel 4 HD|date=8 December 2021|website=Cord Busters|access-date=8 December 2021|archive-date=8 December 2021|archive-url=https://web.archive.org/web/20211208154527/https://www.cordbusters.co.uk/freesat-channel-4-hd-music-channels/|url-status=live}}</ref>

On 27 September 2022, the other 6 advertising regions of Channel 4 (South, Midlands, North, Scotland, Northern Ireland and Rep of Ireland) were made available in HD on Sky and Virgin Media.<ref>{{cite web|title=Channel 4 South & East – LyngSat|url= https://www.lyngsat.com/tvchannels/uk/Channel-4-South-and-East.html|publisher=LyngSat|access-date=15 August 2022}}</ref><ref>{{cite web|title=Channel 4 Midlands – LyngSat|url= https://www.lyngsat.com/tvchannels/uk/Channel-4-Midlands.html|publisher=LyngSat|access-date=15 August 2022}}</ref><ref>{{cite web|title=Channel 4 North – LyngSat|url= https://www.lyngsat.com/tvchannels/uk/Channel-4-North.html|publisher=LyngSat|access-date=15 August 2022}}</ref><ref>{{cite web|title=Channel 4 Scotland – LyngSat|url= https://www.lyngsat.com/tvchannels/uk/Channel-4-Scotland.html|publisher=LyngSat|access-date=15 August 2022}}</ref><ref>{{cite web|title=Channel 4 Northern Ireland – LyngSat|url= https://www.lyngsat.com/tvchannels/uk/Channel-4-Northern-Ireland.html|publisher=LyngSat|access-date=15 August 2022}}</ref> Prior to this, Channel 4 HD was only available in the London advertising region.<ref>{{cite news|title=Channel 4 on 104 — Digital Spy|url=https://forums.digitalspy.com/discussion/2385132/|newspaper=Digital Spy|access-date=15 August 2022}}</ref>