Haltadefinizione have released the single highest resolution digital image ever. The last supper is now available for all to study at that adress. You can inspect it down to the most minute detail, which was previously possible only for someone with the right permissions and equipment where it is currently being displayed.
The site is getting hammered though, so don't expect to be able to get the most detailed view anytime soon. Just open it and let it load, heh.