How to remove background from an image with Gimp?
There are several ways, like always, like in Adobe Photoshop or the like. One that comes to mind that used to work: use magic wand to select the background (and interior parts if you want them to go away) , do whilst shift pressed to add more areas, hit ctrl+i to invert selection, and without deselecting (so it gets placed in same area) hit ctrl+v. Then in layers window right click on that strange new layer created, and in the context menu that pops, select "new layer", it will be only the pixels you want and the rest is transparent. Now you'd delete the background layer (your original scan)