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Brush Stroke Analysis

Folks

A persistent theme in our journey involves fakes and frauds.
This link has a couple of interesting videos: Note please use the URL link the images are not live links.

http://www.pbs.org/wgbh/nova/tech/art-authentication.html




The video frame showing a paintbrush is a twelve minute explanation of how brushstroke analysis is used by computers to discriminate the masters style from the fake. Excellent production. Here is the blurb:
Vincent van Gogh has inspired several talented artists to turn their hands to forgery. Can computers be used to identify which works are really his? To find out, NOVA scienceNOW, working in cooperation with the Van Gogh Museum in Amsterdam, commissioned an expert in art reconstruction to make a meticulous copy of a van Gogh painting. Then, we challenged three different computer teams—from Princeton, Penn State, and Maastricht universities—to see if they could spot the imitation in a group that included five genuine van Goghs.
The other longer documentary of about an hour is an attempt to discover if a $20k chalk and charcoal portrait is a Da Vinci worth $100m. This was broadcast on my local television station today and is excellent viewing. Curiously, the online video on this link is not available in Australia due to "rights" restrictions. Here is the blurb:
In October 2007, a striking portrait of a young woman in Renaissance dress made world news headlines. Originally sold nine years before for around $20,000, the portrait is now thought to be an undiscovered masterwork by Leonardo da Vinci worth more than $100 million. How did cutting-edge imaging analysis help tie the portrait to Leonardo?
Denis

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