GIMP is a free Photoshop alternative that lets you create and edit graphics just like Photoshop. In this video, I'll show you exactly how to use Gimp, step by step. First, I show you how to download ...

In the Gimp, you should be able to simply use the elliptical selection tool (E) to select the area you want, and then either copy and paste into another image, or Select->Invert (Ctrl+I) and then Edit ...