Line art and bitmap images must measure 1200 DPI at the intended dimensions of the ad. Digital files with flattened CMYK or grayscale TIFs or JPGs must have a minimum resolution ol 300 DPI. Color ads must he submined as CMYK (not RGB). Files must be print-quality PDF documents (with all fonts and graphics embedded) at a minimum resolution of 300 DPI.
Download Ad Spec Sheet Here.