 The reforms that resulted from this council are what set the basis for what is known as the Counter-Reformation.Italian painting after the 1520s, with the notable exception of the art of Venice, developed into Mannerism, a highly sophisticated style, striving for effect, that concerned many churchman as lacking appeal for the mass of the population.Church pressure to restrain religious imagery affected art from the 1530s and resulted in the decrees of the final session of the Council of Trent in 1563 including short and rather inexplicit passages concerning religious images, which were to have great impact on the development of Catholic art.