The large format photobox prints are printed at 254dpi (100 pixels per cm) so that's the ideal, your're looking at 7620 * 5080 pixels for one of the big 20"x30" ones. However there's no need for that sort of size, I regularly get 8Mp (3500x2300 or so) images printed to that size and they're spot on.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.