Still about Mona Lisa, the Louvre’s version have been virtually restored in 2004 by Multispectral camera technology. According to the article, at Lumiere Technology website,
“The hidden knowledge of the true colors was revealed by multispectrally scanning the painting in thirteen channels – from Ultra Violet to Infra Red. Then the spectral response curve of the varnish in each pixel was isolated and subtracted from the digital file to virtually reveal the surface of the painting when it had freshly exited Leonardo da Vinci’s workshop.”
Left: Actual painting. Right: Virtually restored painting.
There is a lot of good information about the process, including other paintings scan on Lumiere website:
True Colors of the Mona Lisa Revealed
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