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1/0.418985 == 2.38672/1.0 (G

1/0.418985 == 2.38672/1.0 (G/R coeffs ratio). Or, in other words, dcraw_process scales WB coeffs to get full data range after WB applied (and scaled at some time).

BTW, I still not sure that RAW value inversion leads in the right direction. Why not invert (w/ mask subtraction) image after raw processing applied?

-- Alex Tutubalin @LibRaw LLC