graphics - Get true color from photo -

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i have following problem. developing android app, allow real color photo captured phone camera. pick pixel , real color. how trying solve it: captured photo of real black , color in photo. not same every time captured, because of light , etc. close (0, 0, 0) in rgb. last time got (12, 13, 45). , captured image want true colors , when pick pixel there tried vector math. know (0, 0, 0) converted camera (12, 13, 45), , other color (x, y, z) should (x + 12, y + 13, z + 45). see not right assumption.

so know how solve problem?

edit not real color. want color close real one.


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