Henri Rousseau, Woman Walking in an Exotic Forest, 1905, Barnes Foundation, Philadelphia (Photo: Courtesy of the Barnes Foundation, Merion and Philadelphia, Pennsylvania)

The Barnes Foundation has joined a growing list of museums and other institutions that are designating their public domain images as Open Access. As always, this applies only to artworks not still protected by copyright, so most 20th-century artists (most notably Matisse, in the case of the Barnes) are excluded. But images of works by many earlier artists (such as Renoir and Cézanne) in the Barnes’ collection are now free for unrestricted use.