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.
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.