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"... - call "subtract_black()

"... - call "subtract_black()" (just in case black has not been subtracted by "unpack")..."

blacks are NOT subtracted by unpack().
If you wish to use Libraw's imgdata.image[] array (not imgdata.rawdata.*), you also need to call raw2image() or raw2image_ex(). The second one could subtract black if called with (true) arg (and if other parameters you use do not prevent black subtraction on copy).

-- Alex Tutubalin