 This gave the landscape background an importance which marks an innovation in Venetian art, and was quickly followed by his master Giovanni Bellini and others.Giorgione began to use the very refined chiaroscuro called sfumato—the delicate use of shades of color to depict light and perspective—around the same time as Leonardo.Whether Vasari is correct in saying he learned it from Leonardo's works is unclear—he is always keen to ascribe all advances to Florentine sources.