This article is about film colour recovery. For film colourisation, see film colorization. For the Hewlett-Packard technique, see HP Color recovery.
Colour recovery (or colour restoration) is a process that restores lost colour to television programmes that were originally recorded on colour videotape but for which only black-and-white copies exist.[1] This is not the same as colourisation, a process by which colour is artificially added to source material that was always black-and-white (or for which no colour information was preserved in the black-and-white copy), or used to enhance poor-quality original sources. Colour recovery is a newer process[2] and is fundamentally different from colourisation.[2] Most of the work has been performed on PAL programmes, but the concept is not fundamentally restricted to that system.[1]
Colour recovery can be based on combining colour information from lower-quality recordings, or in the case of the BBC's new method, the particular effects created when colour source material was encoded into the common analogue television format PAL for transmission. With early colour televisions, until the mid-1980s, this could lead to a problem known as dot crawl because the encoding of colour information could interfere with the underlying signal. This causes a form of distortion in the output signal displayed on the screen. The pattern is evident even if the resulting image is recorded on film and in black and white. The colour recovery process detects these telltale patterns and uses them to decode the original colours.
As of 2018[update], colour recovery has successfully been applied to episodes of the BBC TV programmes Doctor Who (exception of the First part of the Invasion of the Dinosaurs),[2]Dad's Army,[3]Are You Being Served? and The Morecambe & Wise Show.
^ ab"PAL Colour Recovery from black-and-white 'telerecordings'". William Andrew Steer, techmind.org. 2008-05-08. Retrieved 2009-05-18.
^ abcNorton, Charles (2008-03-06). "Putting colour back in the Doctor's cheeks". The Guardian. London. Retrieved 2009-05-18.
^Norton, Charles (2008-12-11). "Unscrambling an army of colours". The Guardian. London. Retrieved 2008-05-18.
Colourrecovery (or colour restoration) is a process that restores lost colour to television programmes that were originally recorded on colour videotape...
portion of Episode 6 remained in colour. In 2007, BBC archive specialist James Insell established the ColourRecovery Working Group, an online project...
astronauts, who lost contact with Earth eight months earlier. When the recovery crew returns to earth, it is captured by General Charles Carrington, also...
DVD in June 2013. Episodes two to six were restored to colour via the chroma dot colourrecovery technique used for other black-and-white Pertwee-era stories...
Films with software developed by the ColourRecovery Working Group. This version was released on DVD in 2009. The colour masters for the other five episodes...
of Episode 1 as the default and also a 'best-endeavours' attempt at colourrecovery of this episode as a branched-extra feature. This serial was also released...
were Afraid to Ask". Archived from the original on 3 March 2016. "PAL ColourRecovery from black-and-white 'telerecordings'". William Andrew Steer, techmind...
broadcast. They were restored in 2014 using Richard Russell's colourrecovery process, which uses colour signal information (commonly referred to as chroma dots)...
originally recorded on 2" colour videotape. In 2008, the film underwent the Chroma dot colourrecovery and was broadcast in colour for the first time in almost...
recorded sufficient colour information as a dot crawl pattern to allow colourrecovery. A few audio recordings of Till Death Us Do Part have been recovered...
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sulfide and other compounds from the recovery boiler in the kraft process. The liquor's eponymous green colour arises from the presence of colloidal...
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