A painting thought to be by Johannes Vermeer isn't a Vermeer after all. The 17th-century Dutch master left behind few works, so take even one away and it's a big deal. New technology is allowing experts to see art in a different way and help make these judgments. Jeffrey Brown visited the National Gallery of Art in Washington for our arts and culture series, "CANVAS." PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders