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Some related engineering genius: the artefacts created in the black and white picture by the colour signal are hardly noticeable, but they are enough to recover the colour from a black and white recording!

https://colour-recovery.fandom.com/wiki/The_Unofficial_Colou...

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That's amazing! I wonder if there are still photographs floating around which could be colour decoded too.

Maybe a recorded broadcast of a photo?

Only if the photo itself was in colour and broadcast in colour. It's the other way around I was thinking of - a still shot (in black and white) of a PAL or NTSC signal would still contain enough information to decode the colour now, in retrospect.

For instance, a high resolution (still) film photo of a large high resolution TV from back in the day.

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