Eli5: How do photo restoration artists know the supposed colors of greyscale images?

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Are the colors based purely on their assumptions/imagination, or do the greyscale images retain some sort of data that tells what color on what part?

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Anonymous 0 Comments

Photography has only been around for a blip of time, and humans tend to keep records and save things for reference and remembrance..So actually, when you watch such shows as The Repair Shop, they explain that many of the historical items they recover are restored using rather descriptive letters and memories from the guest owners. If you have a snippet of cloth, some old paint chips, or maybe unrestored furniture they reveal a huge amount of colors and patinas and historical processes for making dyes.

On a funny note, when we had a black and white TV there was Rula Lenska to explain why you’re using the incorrect Alberto VO5 hot oil treatment: “Hello, my name is Rula Lenska, and my hair is red, my dress is green and my eyes are bright blue. If these colors don’t look right to you then…”

Or maybe it was an ad for RCA color TVs…

My family has a ton of old black and white photos, and we were inquisitive about the colors of cars, houses, clothes, wallpaper, etc.

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