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C-Day is the name of two television-related events: 1 March 1975, whenAustralia moved to regularcolour television, and 1 July 2000, the day theUK television industry began accepting onlywidescreen commercials, an important step in the general move of broadcasting in the UK to the picture format.
Australia was a little late in introducingcolour television, to choose the correct television system, waiting about 8 years from the timePAL was invented.
It was then forbidden for broadcasters to transmit thechroma burst signal, until the designated day, 1 March 1975.[1][2] The broadcasters were allowed to experiment with transmitting colour signals in the picture area, and get their transmission up and running while people who had already bought colour TV sets could only watch the shows in black and white. There were some people who built a circuit to circumvent this, where they would synchronise thechrominance decoding oscillator manually.
C-Day orCommercials-Day, 1 July 2000, was the date at which UK broadcasters (with the exception ofMTV andVH1[3]) changed from requiring4:3aspect ratiocommercials, to requiring 16:9 Full Height commercials supplied to them, shot "14:9safe" for those channels which in part (i.e. the analogue feeds ofterrestrial broadcasters) or in whole (many cable television and satellite television channels) continued to broadcast a 4:3 frame.[4]
It was originally proposed by ITV in July 1999.[5][6]
ITV andChannel 4 took advantage of C-Day to update theircontinuity suites to be widescreen capable, broadcasting theiridents in widescreen.[7]
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