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1) To disable auto

1) To disable auto-brightening of images:
- set params.no_auto_bright to 1
- set params.adjust_maximum_thr to 0.0 (in this case, for some cameras you may need to set params.user_sat /white point/ manually to avoid pink tint in highlights)

Afterh that, images (with same exposure) will be processed with same data maximum and no automatic brightening.

2) To adjust brightness (at output stage) use params.bright to some value above 1.0

-- Alex Tutubalin @LibRaw LLC