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For -H 2 and -H 9 the results

For -H 2 and -H 9 the results are bitwise the same for dcraw and dcraw_emu (from 0.13.5) and my sample image (something with blown clouds)

The difference may be in auto-maximum feature in LibRaw (very useful for some cameras). To turn this feature off use -c 0 switch when running dcraw_emu:

dcraw_emu -c 0 -H 2

-- Alex Tutubalin @LibRaw LLC