Brightness Screen Filter <p>Does anyone have an idea how to implement an Brightness Screen Filter like the one here:</p> <p><a href="http://www.appbrain.com/app/screen-filter/com.haxor">http://www.appbrain.com/app/screen-filter/com.haxor</a></p> <p>I need a starting point and I can't figure out how to do it.</p>