How do I invert the colors of an image?

I'm using macOS 10.13 and I wish to use built-in Apple software or freeware.

1 Answer 1

  1. Open the image in Preview.app (macOS built in default image viewer).
  2. Choose Tools → Adjust Colour ⌥⌘C.
  3. Swap the left-most and right-most points on the graph.


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