The File Resolution Guidelines.... Your final designs should be at 300 DPI resolution or higher. Vector-based programs like Illustrator, CorelDraw or QuarkXpress don't require specific resolution settings; we can export the print-ready file from these programs at any resolution we choose. The basic rule to follow is: If your design software program offers you resolution (dpi) settings, then set them to 300, up to 600. We print at 300 dpi, which gives just the right amount of definition and clarity for beautiful offset-press, full-color results. If you want to be safe (or just feel a bit paranoid), feel free to set your design resolution to as high as 600. It certainly won't hurt....