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exp_shift doesn't work as expected

Submitted by mko on

I wanted to use the following values to shift exposure :

    imgdata.params.exp_correc = 1;
    imgdata.params.exp_shift = 1.0;
    imgdata.params.exp_preser = 0;

but only value 1.0 <= exp_shift <= 8.0 seems to result in a different exposed output ( lighter ).
All images created with setting 0.25 <= exp_shift < 1.0 look the same ( not darker ) ?

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