My partner has worked in graphics for quite some time. So he has gotten me in the habit of rendering things at 300 dpi and as a TIF in case I ever want to have them printed off. I don't even pretend to understand how everything works when it comes to these new digital presses, however, I usually render at a resolution of 3300x2200. This would make the initial print out no bigger than 8-1/2 x 11. However, the size for the print out is easily adjusted using photoshop, and he recommends that you have the file sent to the print controller in RGB mode as the color conversion to CMYK is more appropriately handled by the print controller than by the computer you are rendering or utilizing photoshop on (the colors tend to appear closer to the RGB values once printed so they don't appear so washed out by the end of the process). If you think that adjusting the image size after rendering the picture, it doesn't. We have had a number of the pieces I have worked on enlarged for the offices of friends. They cover complete walls and there was no degradation in the appearance after printing. It certainly takes longer to render this way than as a JPG, but in the long run it might save some time and disk space. Doug