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For example if my room is illuminated with a yellow light, or if is dark I'd like to get the approximate manufacturer RGB values of the color on the wall.
In my honest opinion, that is simply impossible. For this to work, you would need to know the exact details of the illumination sources, to cope for that and even then, we are not considering color binning of sensors, deterioration of paint, influences like cigarette smoke, dust, filth, ...
Computer vision can do a lot, but I am pretty sure this is one bridge to far. It is not an oracle :D
