Beginning Photo Retouching & Restoration Using GIMP by Apress publishing teaches readers how to digitally retouch and restore damaged photographs with GIMP 2.8-the free high end alternative to expensive image editing programs.
Check out the GIMP 2.6 cookbook by Packt Publishing. It's a great way to start learning some GIMP skills.
You can buy an ebook or hardcopy. Through examples you can quickly learn about the possibilities of the GIMP.
TIP
When using the GIMP you have many possibilities. This can sometimes be very time consuming. You can use the build-in scripts to speed up the process. And you can extend the GIMP with the FX Foundry plugin to add lots more scripts.
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