Ariel, is the background one color?  Because, if so, Gimp has a way to easily remove a single color from an image and replace it with transparency.  With the image open,<br/>Go to layer<br/>Transparency<br/>Add alpha channel.<br/><br/>Then, once the channel is added,<br/>Go back to layer<br/>Transparency<br/>Then down to Color to Alpha<br/>Choose the Color of the background<br/>And voila.  The background is now transparent.<br/><br/>Also?  My revised Apollo signature.<br/><br/>(http://i14.photobucket.com/albums/a304/RuffNRowdy/Elliquiy/VivSig_zps7eace60e.jpg)