Eli5: How do black and white movies/documentaries get turned into color?

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I’m watching all these WW2 documentaries and they all have it in color now. How did they do this? I kind of understand exposure and film but that’s about it.

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4 Answers

Anonymous 0 Comments

It’s all done with computer after effects. 

Many of the original pieces still exist; so we know the color of flags; uniforms; buildings.  Civilian fashion is also known and we can make best guesses that in b&w; that particular grey would have been red if using colorized film

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