Xybernetics Transparent Background Using GIMPSome image types lack a transparency channel (JPEG for example). If this is the case, you will need to add an alpha transparency channel. Generally in GIMP, you can do this by by selecting Colors -> Colors to Alpha.
The next few screen shots outlines step-by-step method of applying the alpha transparency channel to your image.

1) Open your image using GIMP
Xybernetics Transparent Background Using GIMP

2) Select the “Magic Wand Tool” from the “Toolbox”
Xybernetics Transparent Background Using GIMP

3) Select all areas that you want to be transparent. You can select multiple areas by holding the shift key and clicking on the area.
Xybernetics Transparent Background Using GIMP

4) From the pull down menu, select Colors -> Colors to Alpha
Xybernetics Transparent Background Using GIMP

5) Click on OK on the “Color to Alpha” popup window.
Xybernetics Transparent Background Using GIMP

6) You now have and image with transparent background.
Xybernetics Transparent Background Using GIMP

7) From the pull down menu, export to an images file by selecting File – > Export As… And then, give the image a name and click on “Export” button.
Xybernetics Transparent Background Using GIMP