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some investigative results

Just an interim update:

libraw reports cblack values as all 0 for me after unpack()/subtract_black(). Yet, the actual data (RAW image at imgdata.rawdata.raw_image) has minimum 509 and maximum 6069 before and after subtract_black().

To me it looks like subtract_black() either does not use "imgdata.rawdata.raw_image" (since its data has not been changed) or I need to add another step between unpack() and subtract_black() to actually get the black data populated. I will give reading the code another go.

To be continued.