In some quarters of the photography world, it's still perceived as a sin to use Photoshop on your images. Never mind that darkroom techniques allowed the old masters, like Ansel Adams, to manipulate their images at will! It's safe to say that this view is quaint at best, and I can't imagine that it will persist for much longer, except among the most hard-line of photographers. A somewhat harder sell might be the legitimacy of found or appropriated images as an "original" work. Again, with the growing (if begrudging?) acceptance of Google Street View imagery, it seems only a matter of time before this work, too, is widely accepted.