E. J. Marey, the painter Thomas Eakins, and Eadweard Muybridge all devised means for making stop-action photographs that demonstrated the gap between what the mind thinks it sees and what the eye actually perceives. Muybridge's major work, Animal Locomotion (1887), remains a basic source for artists and scientists alike. As accessory lenses were perfected, the camera's vision extended both telescopically and microscopically; the moon and the microorganism became accessible as photographic images.
The introduction of the halftone process (see photoengraving; printing) in 1881 made possible the accurate reproduction of photographs in books and newspapers. In combination with new improvements in photographic technology, including dry plates and smaller cameras, which made photographing faster and less cumbersome, the halftone made immediate reportage feasible and paved the way for news photography. George Eastman's introduction in 1888 of roll film and the simple Kodak box camera provided everyone with the means of making photographs for themselves. Meanwhile, studies in sensitometry, the new science of light-sensitive materials, made exposure and processing more practicable.
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