Christian Degrigny is currently professor at Haute Ecole Arc Conservation-restauration (HE-Arc CR). Trained as an electrochemist, he obtained his PhD in analytical chemistry from University of Paris VI in 1990 and specialised then in the application of electrochemical techniques in metal conservation. He worked as a conservation scientist in France (1991-2001), director of studies of a conservation programme in Finland (2001-2002) and director of a diagnostic laboratofy at the Malta Centre for Restoration (2003-2005).Sony George is currently Associate Professor at Colourlab at the Norwegian University of Science and Technology. Before joining NTNU, he worked as a researcher at Gjøvik University College Norway.Jon Y. Hardeberg is Professor of Colour Imaging at the Department of Computer Science at The Norwegian University of Science and Technology, after a short industry career where he designed, implemented, and evaluated color imaging system solutions for multifunction peripherals and other imaging devices and systems.