Video monitoring in the production of TV programmes is important since it is essential that the visual appearance within a single programme is consistent, and that consumers do not need to adjust settings on their TV sets for each programme or when switching channels. Standards are also important to facilitate the exchange of material between broadcasters, and they must be stable in the long term to ensure that material from the archive can be broadcast along-side more recent productions. To a very large extent that "standard" in the past has been provided by the stability of the physical device used, the CRT (cathode ray tube) display. Colour primaries, white point and other basic parameters were defined, and colour and grey scale reproduction could be assumed to be consistent based upon these fairly basic parameters. There were many things which we used to take for granted; things which had never needed to be written down.
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