I have a file which is a very large image - 60" by 72". I want to print it with Adobe reader 8, in absolute exact full size, across as many letter size pages as possible. I have a Canon iP6700D printer and a beefed up system. When I go to poster mode in either Adobe Reader or the printer setup, the best I can do is a 4 x 4 image or 16 pages. I would need on the order of 60 pages. How can this be done?