Example Image: http://img710.imageshack.us/img710/4310/cropexample.png
I need to make a cropping tool such as the on in Photoshop ( Fig.2 )
So is there a way to do selective area transparency( Fig .1 ) ( I have only done whole window transparency )
Because the only way I can think of doing it so far is to make 4 rectangular windows to wrap around the area( Fig .3 ).