1. A system for presentation of image comprising: (a) at least a pair of images of a scene from different viewpoints; (b) selectively presenting images on a display from said different viewpoints such that a viewer observes said scene in a three dimensional manner without glasses for said viewer; (c) wherein at least one of said images is modified based upon a filter that is based upon the human visual system in order to reduce rocking artifacts to a level less than they would otherwise have been had said filter not modified said at least one of said images.