103 year old Alice in Wonderland movie restored

From the BFI site (http://www.bfi.org.uk/nftva/news/alice.html):

With pieces of emulsion having already flaked off the surface of the film, the print was severely damaged, slightly incomplete and with its original tints faded. In 2009, the BFI National Archive was able for the first time to use digital techniques to embark on a restoration, bringing back the film's original colours.

I'd love to learn more specifics about the "digital techniques" they used for restoration.
 
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