eli5 what color cards are in photography and what they do?
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They’re cards where the colours are precisely known, so when you take a photo you can compare the image of the card to the actual card and check that the colours have been reproduced accurately. All imaging systems whether chemical or digital introduced colour shifts, and the cards allow these shifts to be corrected for display/printing etc.
There was a colour chart on the leg of the Viking probe that landed on Mars in the 70s and because of that we know that the Martian sky is pink – prior to that, images were corrected to blue, as that’s what we think the sky should be.
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