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If you will use dcraw_process

If you will use dcraw_process() for image postprocessing, you need to fix values in raw_image[] array, because dcraw_process() will call raw2image_ex(), so override any changes made in image[] array.

Also, you need to set imdata.params.user_black and user_cblack[4] to zero to prevent additional black level subtraction in dcraw_process()

-- Alex Tutubalin @LibRaw LLC