There’s an article here about bringing back colour in videos: [https://www.bbc.co.uk/pressoffice/pressreleases/stories/2008/12_december/09/dadsarmy.shtml](https://www.bbc.co.uk/pressoffice/pressreleases/stories/2008/12_december/09/dadsarmy.shtml)
“James Insell, Preservation Specialist for the BBC Archive, found that many recordings had been created without the colour sub-carrier having been filtered out, and that the colour information was still embedded in the film as a pattern of fine dots – or “chroma dots”. ”
Basically some black and white film still has some colour information encoded. With images however it’s largely done with A.I. with some human help.
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