By Andrew Butterfield Titian, Tintoretto, Veronese: Rivals in Renaissance Venice an exhibition at the Museum of Fine Arts, Boston, March 15–August 16, 2009, and the Louvre, Paris, September 14, 2009–January 4, 2010 On view now at the Museum of Fine Arts, Boston, is the first group show ever organized in America about Venetian painting of the late sixteenth century. Moderate in scale, the exhibition does not attempt a comprehensive survey of the period. Rather, it pre-sents only the three most important Venetian painters of the time--Titian, Tintoretto, and Veronese--and it focuses on a…