Original image is taken from 
<http://www.pbase.com/konascott/image/52972247/original>

program: PhotoShop 6.0

52972247.20Dwith50mmlens.tif:	crop of the original image
52972247.20Dwith50mmlens-down.tif:	down sampled to reduce the number of
					pixels by a factor two (bi-cubic)
52972247.20Dwith50mmlens-back.tif:	back to the original image size
					(again bi-cubic)
52972247.20Dwith50mmlens-usm.tif:	USM applied to the previous image
					(200% / 0.2)