Curves

0:03 Curves · see the starting image
A point curve maps input brightness to output brightness.

0:08 Lift a point in the midtones
Drag above the diagonal to lighten that tonal region.

0:16 Deepen the lower tones
A lower point creates more contrast between shadows and brighter midtones.

0:23 Compare without the RGB curve
The points stay in place while their effect is bypassed.

0:29 Restore the curve
Smooth shapes usually give gentler results than sharp bends.

0:36 Reset and compare the starting state
Only this tool returns to its starting state. Other edits stay.

0:42 Explore the controls in the written tool reference
OmaRaw