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pre_mul and cam_mul are in

pre_mul and cam_mul are in RAW space, these WB multipliers to be applied before color conversion.

rgb_cam is from RAW to 'linear sRGB', so D65.

You can multiply rgb_cam[][] matrix to some adjustment matrix to get other output space (see LibRaw:::convert_to_rgb() source, this function also contains some of correction matrices for Adobe, ProPhoto, WideGamut and XYZ spaces).

-- Alex Tutubalin @LibRaw LLC