If you're a photography hobbyist, would you like to brighten up that gloomy island vacation photo? Slim down without going on a diet? See whether white or green shutters look best on the house? Expunge the ex-boyfriend from family photos? If you're a pro or semi-pro photographer, would you like to make it snow in that ski resort photo? Replace the old logo in the glamour shot of the corporate headquarters with the new one? Grow hair in the CEO's glaring...