The J. Paul Getty Museum has recently decided to offer direct downloads for their copy of Fior di Battaglia through their Open Content Program. Navigate to each image and you'll find, in addition to the zoom-in link, a link to a download page. The images offered are ~3000x4500, same as those on Google Art Project and WikiMedia Commons, but I actually suspect now that the 6000x9000 images found in the zoom window are just upscaled from those scans.
So if you've held off downloading the scans available on the Commons due to moral or legal concerns, you can now get them with a clean conscience directly from the source: http://www.getty.edu/art/gettyguide/art ... rtobj=1706
Furthermore, and this will be a boon to Fiore researchers everywhere, the Getty makes the following statement about all Open Content Program images (including these):
"Open content images can be used for any purpose without first seeking permission from the Getty." (Source: http://www.getty.edu/about/opencontent.html
A good day indeed.