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imgdata.params.bright options

imgdata.params.bright options affects only output (gamma) curve that used on (internal) linear data -> gamma corrected output. Is is very similar to Photoshop curve tool w/ linear curve that starts at 0,0 and ends, for example, at 100,255 (source, dest)

To adjust exposure one may use exp_correc/exp_shift/exp_preserve parameters.

-- Alex Tutubalin @LibRaw LLC