Bitmap Filters

See Jorge's: http://www.lab.embrion2.com/director/bitmap_filters/fx_03_d11.htm

Alpha Channel Addition

By adding additional chunks of white to an alpha channel, we can make an image increasingly transparent. This can be used to "wipe away" a decal layer such as dirt or grime which has an alpha layer and is sitting on top of a background image or, for 3d, a lower texture layer.