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How do I brighten a part of a picture with Gimp?


Question

Say I wanted to bring out the colors in the shadowy bottom right hand part of the attached image, how would I go about it? I assume I need to restrict the processing to that part but I have no idea what technique I should use and how to limit the effect to part of the image.

enter image description here

2016/08/15
1
10
8/15/2016 5:52:00 PM

For a smooth brightening (or darkening) of shadows (resp. highlights) I prefer the color curves tool (Shift+C) where you can define a non-linear curve for all channels, or a single RGB color channel.

In the example image I used a positive S-shaped curve for all values and a negative S-shaped curve to remove blue from the shadow parts of the image:

enter image description here

2016/08/15
5
8/15/2016 7:20:00 PM