So, you have The GIMP installed on your computer, you need to make a quick change to an image for some project, but don't want to learn about computer graphics right now in order to get the image changed. Totally understandable. The GIMP is a powerful image manipulator with many options and tools. However, it is quick and somewhat intuitive (after a time) for the small jobs as well. Hopefully, these quickies will help you with your quick problem and help you to stay friends with The GIMP and ready for its more complex tools and methods later, when you have the time and inspiration.

A couple of words about the images used here. The came from APOD [APOD01], Astronomy Picture of the Day. The screenshots were taken on my desktop which is sporting this APOD [APOD02] image.

All you should need to know to start here is how to find your image and open it. (File → Open from the toolbox menu).