I found the link Will:
http://help.adobe.com …2e081210db09b94-7fef.html![]()
As you can see at the bottom of it:
Press Alt (Windows) or Option (Mac OS) while dragging a slider to see the areas being affected (white) versus the areas masked out (black).
I do this all the time. I hate! universal sharpening!

Great for children shots when they are running around 
Thanks for the link Omar 


