Another way to get the image outlined is to separate/mask off the background in your graphics application, but then get a color sample of the place where the signature is going to go from the forum and use it to fill the rest of the image background with. Then hopefully when you place the finished image/graphic, it will look like it's outlined.
If it's Photoshop I would use a separate fill layer for the forum color, taking a color sample with the Eyedropper tool. Then put that layer in back of the image/graphic after I've outlined it.
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