Omg really? I'll have to try it out! I was trying to mess with it the other day, but I couldn't get it to work..
Turn "Whole Screen" when creating the filter to true and it should affect the pictures on screen too.
Does it work with plugins? (I.E. GALV's layer graphics) :^0
I am not sure as I only test with my own [CGMZ] plugins, however no one has reported any incompatibilities yet.