Note to myself:
1. File => Open
2. Image => Mode => Grayscale
3. Edit => Copy
4. Edit => Undo
5. Layer => New => Transparency => ok
6. Edit => Paste
7. Layer => Anchor Layer
8. Layer => Mask => Add Layer Mask => White (full opacitiy) => Add
9. Now use the Paintbrush-Tool to (re)color the parts of the image you like
Here’s a sample image:
Colorkey image made with GIMP
Nice blog site Thurston (-;
Will try the Gimp How To tonight…..
Here is a nice video tutorial for doing the same thing with Lightroom:
http://neunzehn72.de/colorkey-in-lightroom-fotos-selektiv-entsattigen/
There’s a slight problem with Lightroom, it just cost € 293,82, meanwhile Gimp is open source and free.