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I frequently use Curves to selectively brighten my images during post processing - my workflow is ctrl M - set lighten or darken - ctrl I to invert - select paint brush and color.

I may be missing something but nothing happens when I try to lighten area's of my image.


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There are variois things which could break the workflow:

  • a selection I still active. Single pixel selections may be unnoticeable. Try to use CTRL-D before adding / inverting layers
  • how do you set the blend mode, by mouse or (new in 2.1 beta) keyboard shortcuts? A common issue is that keyboard shortcut depend on where the input focus lies, and some keys may change the function depending on position. Old bug: Some numeric input requires Enter key before getting applied. 
  • brushes are notorious for causing trouble. E.g. brush settings / brush not as expected. Try to paint on a new pixel layer to check if brush works as expected.

Mac mini M1 A2348

LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5

iPad Air Gen 5 (2022) A2589

Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps.


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