To quote from a piece in the UK’s Daily Telegraph:
The company put Leonardo’s “Last Supper” online three years ago, but the technology has advanced since then. Today, it shows details up to a hundredth of a millimetre.
The technology entails taking hundreds of pictures of tiny portions of the artwork and then combining them to recompose the whole image.
There are all sorts of works on the site – this link will take you to a detailed viewing of Botticelli’s Birth of Venus, online until at least the end of January 2011.
Make ticket reservations for the Uffizi Gallery, Florence
Reservations for Da Vinci’s Last Supper, Milan