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For step 5: look into LibRaw:

For step 5: look into LibRaw::cam_xyz_coeff() source, it takes 'adobe ColorMatrix1/2' as cam_xyz and splits it into daylight color balance (pre_mul) and camera2srgb matrix (_rgb_cam).

For steps 2-4: scaling (usually) will not result into values above clipping (whitepoint), if whitepoint is scaled too. But WB may result into too big values that need to be clipped (so called 'pink clouds' problem), so either WB first, or WB + scaling + clipping in one step.

-- Alex Tutubalin