Hi G__day,
try around the 70 mark for gain and around the 40-50 mark for offset with Jupiter. There are 2 sliders with the autocontrast histogram. white and black. adjust the black slider (top) to the left of the histogram bar and the white slider (bottom) to the right of the histogram bar. Ensure that there is no white lines from the histogram as this is clipping.
Cheers.
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