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Adobe uses own raw processing

Adobe uses own raw processing engine, different from LibRaw. There is no known rule(s) to convert Adobe sliders into LibRaw's imgdata.params

Also, I do not think that altering imgdata.image values without some knowledge of LibRaw::dcraw_process internals is a good idea. You may either study it (it is opensource, so it is possible), or create own raw processing.

LibRaw's dcraw_process() is very similar to dcraw.c processing, so you may find this link useful:

-- Alex Tutubalin @LibRaw LLC