Ditto, I'm confused as well. Fischkopf, who are you talking to? If it's the OP, then you need to reread it carefully.
You linked the Perfectum filter as a "more efficient upscaling method" when Omzy and myself have already implemented the Perfectum 2 filter to field, battle, world, and magic textures. The OP is not fully satisfied with this method (which I agree) because it is NOT more efficient and is trying to show us a better upscaling algorithm that can be implemented within a shader, or in our case Aali's Driver, to enhance textures without having to deal with the manual labor and file size increases with PNG upscaling.