(I) X-rays, chemical analysis of paint and close scrutiny by expert eyes are all used to tell art forgeries from the real thing. (II) But now computer scientists at America's Dartmouth College have come up with a digital method for sorting the real from the counterfeit. (III) Drawings or paintings are scanned at high resolution and a computer breaks them down into digital elements called wavelets. (IV) An analysis of Madonna with Child by the Renaissance painter Perugino showed that at least four people had worked on the six faces in the painting. (V) The wavelets are then analyzed statistically to find consistencies or differences.