To make this work, all you need to do is click the reverse end on the Eraser tool in the Toolbox The work of this tool is the same as the magic wand tool of Photoshop.In GIMP, to remove background this tool works nicely.
It will run on Microsoft Windows, the Mac OS and Linux.
You will get a 'negative' of your image (white is what is fully selected, and the 'Alpha to selection' selects pixels according to their opacity).
You will get a "negative" of your image (white is what is fully selected, and the "Alpha to selection" selects pixels according to their opacity). Select>Selection editor to open the selection editor.