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Short answer:

Short answer:
- you need to subtract black level values from (unaltered) RAW values
- than multiply to normalized per-channel WB coefficients.

Long(er) answer: use subtract_black(), scale_colors() and pre_inteprolate() functions code as a reference, these functions are called before interpolation (demosaic) call to perform data ajustments before debayering.

-- Alex Tutubalin @LibRaw LLC