Ya like you can always try to render it all at once to disk to. My buddy just tried that in Bryce, A simple picture but lots of lights and not to big 1600 X 1200 and it took forever to render. Weeks and he crashed his computer at 85% antialasing so he got nothing to show for it.... Like it's pick your poison.... Tile rendering and he'd be done by now. If you got Photoshop or similar progam it's the sencible way to do it.