Is it a football club logo ? I can not find that one but as an example. this:
Use Colours -> Color-to-Alpha and what ever colour specified, white is default, becomes transparency. Transparency is depicted in Gimp as a checker pattern. Export your image as a png file to preserve transparency.
Use Colours -> Color-to-Alpha and what ever colour specified, white is default, becomes transparency. Transparency is depicted in Gimp as a checker pattern. Export your image as a png file to preserve transparency.