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camera matrix should be the

camera matrix should be the same unless changed by camera based on temperature or self-calibration (may be some high-end digital backs?)
camera WB will change from shot to shot, indeed.

So, you may get camera multiplicators for the first shot in sequence and re-use it for next shots (user_mul).

Same with black level: it may change from shot to shot (e.g. Panasonic or Canon cameras), so get it for first shot then reuse (user_black, user_cblack)

Also, set adjust_maximum_thr to 0.f

-- Alex Tutubalin @LibRaw LLC