Download Instant Mask, to remove the background of an image subject
Instant Mask is a free, quick and easy to use program that will remove the background of a picture.
It gives you two brushes to let you define roughly the background area to be removed, and the foreground area you’d like to keep – like when, e.g. you’d like to keep a bird and remove the sky behind the bird.
Instant Mask is specialized to that task, and it works even better than some painting programs which include a magic wand to perform a similar operation.