The extraordinary range and complexity of the photographic process is explored, from the origins of the medium in the 1840s up to the advent of digital photography at the end of the 20th century, in a comprehensive exhibition and its accompanying guidebook at the National Gallery of Art, Washington. On view in the West Building, from October 25, 2009 through March 14, 2010, 'In the Darkroom: Photographic Processes Before the Digital Age' chronicles the major technological developments in the 170-year history of photography and presents the virtuosity of the medium's practitioners. Drawn from the Gallery's permanent collection are some 90 photographs—ranging from William Henry Fox Talbot's images of the 1840s to Andy Warhol's Polaroid prints of the 1980s.