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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[This video](https://youtu.be/vubuBrcAwtY) focuses on one team that restores and colorizes photos for archival purposes. It can take lots of painstaking research to ensure accuracy if the team takes it seriously.
Now there is also the artistic side where artists can take liberties to place their own ideas of colors onto photos, which at that point just relies on understanding light and shadow and how that can affect colors on different surfaces or materials
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