Very cool and useful. Could be softer. Looks a little squary/strange. Is it screen size independent?

In anyway very good contribution. I would even buy a fast tool which alternates the screen, like gaussian blur, niedrigbandfilter (don´t know what that is in english, but it's a mix of a transparent gaussian blurred image over the real image which then get together as one image some contrast added) and negative screen render over a certain area (via mask or x,y coordinates) and more fast filters are good ether. And they should work on many computers So it looks everywhere the same. Man, that would be cooool.

regards, EX Citer