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Whenever A Color Photograph:
It is inconvenient to set up three magic lanterns whenever a color photograph a color photograph is to be looked at. A portable apparatus, the Kromskop, was devised in 1892 by Frederic E. Ives of Philadelphia, which optically reunited three stereoscopic transparencies so they could be viewed in register. Each transparency was illuminated through a Filter of the appropriate primary color: red, green, blue. The result was a brilliant color photograph in three dimensions, of startling realism.These techniques have the same limitation as the daguerreotype and the tintype: each color photograph is unique. The negative-positive principle was utilized in Kodacolor film (1941), which is similar in general principle to Kodachrome film, except that the image is not reversed to a positive. Dye-coupling development directly converts each emulsion to an image complementary to the color it records. Thus a color negative shows not only reversal of the lights and shades, but also of color. A blond will appear with blue hair and green lips. From this negative any number of prints can be made by repeating the process with identical triple emulsion coated on a white base.
Lange could make a deserted farmhouse, abandoned in acres of machine-plowed land, an eloquent definition of the phrase "tractored-out," which was on the lips of hundreds of dispossessed farmers. Her photograph of a migrant mother surrounded by her children, huddled in a tent, became the most widely reproduced of all the FSA pictures. She wrote: My own approach is based upon three considerations. First—hands off! Whatever I photograph, I do not molest or tamper with or arrange. Second—a sense of place. Whatever I photograph, I try to picture as part of its surroundings, as having roots. Third—a sense of time. Whatever I photograph, I try to show as having its position in the past or in the present.
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