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The Book of GIMP by Karine Delvare, Olivier Lecarme

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Appendix A

Exercise A.1 Figure A-13 is a special case. The simplest solution here is to select Image: Colors > Desaturate and to choose AVERAGE. For the three other figures, the best solution is to correct each color stripe by hand, using the Fuzzy Select tool to select exactly one stripe and using the Image: Colors > Hue-Saturation tool to change the color of the stripe as you wish.

Exercise A.2 First, create a new white layer and place it under the image layer. Select the top layer, and reduce its opacity to 50%. Next, add a transparent layer above this layer, and draw the polygons on it with the Pencil tool, using the key to draw straight lines. ...

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