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The "has been subtracted at

The "has been subtracted at the unpacking stage" statement covers "possibility": if black pattern is not covered by black/cblack[], the only way is to subtract it on unpack to prevent LibRaw user from camera-specific details.

From user's point, there is no difference between 'black subtracted by camera' (e.g. old Nikons) and 'black subtracted on unpack()'

-- Alex Tutubalin @LibRaw LLC