Summary: Matched pictures were taken with a Nikon D90 and a Nikon D7100. Both images were upsampled for printing at 20 x 13.3 inches (51 x 34 cm) and 360 pixels per inch (ppi) on an Epson Stylus Pro 3880. PhotoZoom Pro 6 (BenVista, Ltd.) was used for upsampling. The resulting prints from the two cameras were nearly indistinguishable with respect to amount and quality of fine detail. As a “control”, prints were also made with upsampling left in the background, under the control of the printer driver or Lightroom. The resulting prints were quite good, but noticeably lower-quality than those made from images upsampled with PhotoZoom Pro. The “native” resolution of the D90 image at 20 x 13.3 inches is only 214 ppi. These results argue that the frequently cited 300-pixel-per-inch rule for high quality ink jet printing is overly conservative when using current software and hardware.
Key words: print resolution, resampling, Nikon D90, Nikon D7100, Lightroom, Photoshop, PhotoZoom Pro, S-Spline Max, Epson Stylus Pro 3880, Eric Chan