I have never really thought about it much but I do suppose you could reverse engineer a shot based on the tones of the black and white to be in the ballpark of the white colors. Taking something from color to black and white creates a very specific imagine so theoretically you should be able to go backwards from there...but so much can change with the levels and filters. If you could guess with good accuracy one of the colors in the photo and work from there you could probably get good colors in relation to the tone of another.
Shit is all bottled up in my head.
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