hey,
one of my friends told me that a wallpapers i made on photoshop and posted up on another forum was pixelated and blurred at it's max resolution (1400x1050) buggerish. but i found a filter that helped me out no end in getting the quality back so:
before:
After:
the filter was the high pass sharpen filter. if you look around you'll find it pretty easy
I dont get why you need an external plugin when it is already built in photoshop fiter > other >high pass and then set the bending mode to however you want the trick is with the duplicated layer your adding the high pass on is to adjust the pixel radius so that it is almost a line drawing on the grey background then you get really sharp results. if need be then duplicate the high pass layer a few times