do you have a tut for it or something?
I Read one to learn, but i didn't keep it, because I had memorized how to do it, but I will tell you how to:
1.)Go to layer->Flatten image.
2.)Then dulpicate the "backround" layer.
3.) Delete, "backround" layer.
4.)Select the "Rectangle Marque Tool"
5.)Drag the tool from top left corner to the bottom right corner
6.)Select-> Modify-> Smooth on 10 px
7.)Press shift +ctrl+ I (to select inverse)
8.) Press delete
9.) Crtl + d (to deselect)
You are done! Be sure to save as a .png