The communications revolution changed everything, including art: a statement that was just as true in 1514 as it is 500 years later. What transformed the world back then was printing, and some of the results are on view in “Renaissance Impressions: Chiaroscuro Woodcuts From the Collections of Georg Baselitz and the Albertina, Vienna” (Royal Academy, London until June 8). They are as beautiful as they are unfamiliar.