A little bit more: the resolution of an image and the printing resolution of, say, an Epson printer are two different things. For the Epson, in fact, we'll speak of "diffusion" of ink droplets. So you don't need to have an image at 1400 dpi to print at 1400 dpi on an Epson. Just use a 300 dpi image, and print at the 720 diffusion, which is usually excellent... Otherwise the file size will be incredible...