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1. To get LibRaw as close as

1. To get LibRaw as close as possible to Nikon converter, you need to repeat Nikon converter in most important things: color profile, contrast curves, white balance data, color dithering.

2. output gamma curve (from 16 bit linear to 8-bit gamma) may have holes. Also, in deep shadows some values are missing because of linear sensor nature.

3. You've used no-auto-bright in LibRaw, but no corresponding switch (-W) for dcraw.
Also, if you wish to repeat dcraw as close as possible, set adjust_maximum_thr to 0.f

-- Alex Tutubalin