Цветная фотография: история и принципы воспроизведения цветов

Photography that reproduces colors

Color photography is a type of photography that uses media capable of capturing and reproducing colors. By contrast, black and white or gray monochrome photography records only a single channel of luminance (brightness) and uses media capable only of showing shades of gray.

In color photography, electronic sensors or light sensitive chemicals record color information at the time of exposure. This is usually done by analyzing the spectrum of colors into three channels of information, one dominated by red, another by green and the third by blue, in imitation of the way the normal human eye senses color. The recorded information is then used to reproduce the original colors by mixing various proportions of red, green and blue light (RGB color, used by video displays, digital projectors and some historical photographic processes), or by using dyes or pigments to remove various proportions of the red, green and blue which are present in white light (CMY color, used for prints on paper and transparencies on film).

Monochrome images which have been "colorized" by tinting selected areas by hand or mechanically or with the aid of a computer are "colored photographs", not "color photographs". Their colors are not dependent on the actual colors of the objects photographed and may be inaccurate. The foundation of all practical color processes, the three color method was first suggested in an 1855 paper by Scottish physicist James Clerk Maxwell, with the first color photograph produced by Thomas Sutton for a Maxwell lecture in 1861. In his studies of color vision, Maxwell showed, by using a rotating disk with which he could alter the proportions of visible hue, or gray tone. This could be made by mixing only three pure colors of light – red, green, and blue – in proportions that would stimulate the three types of cells to the same degrees under particular lighting conditions. Each type of cell by itself did not actually see color but was stimulated. He drew an analogy to black and white photography: if three colorless photographs of the same scene were taken through red, green and blue filters, and transparencies ("slides") made from them were projected through the same filters and superimposed on a screen. This would result in a image reproducing not only red, green and blue, but all of the colors in the original scene. The first color photograph made according to this method, a set of three monochrome "color separations", was taken by Thomas Sutton in 1861 for use in illustrating a lecture on color by Maxwell, where it was shown in color by the triple projection method. The test subject was a bow made of ribbon with stripes of various colors, including red and green. During the lecture about physics and physiology, not photography, Maxwell commented on the inadequacy of the results and the need for a photographic material more sensitive to red and green light. A century later, historians were mystified by the reproduction of any red at all because the photographic process used by Sutton was, for all practical purposes, insensitive to red light and only marginally sensitive to green. In 1961, researchers found that many red dyes also reflect ultraviolet light, coincidentally transmitted by Sutton's red filter, and surmised that the three images were probably due to ultra violet, blue green, and blue wavelengths, rather than to red, green, and blue.

The Joly screen process emerged as a simpler and cheaper alternative, requiring no specialized camera or viewer. Instead, it necessitated a unique color compensating filter for the camera lens and a particular holder for the photographic plates. The core of the system resided within the holder: a clear glass plate meticulously ruled with fine lines of three colors, creating a repeating pattern across its entire surface. Rather than capturing three separate photographs through individual colored filters, this method employed narrow strips (the colored lines) to allow the essential color information to be recorded in a single, composite image. After developing the negative, a positive transparency was produced, and a viewing screen—with red, green, and blue lines matching the taking screen's pattern—was precisely aligned and applied, rendering the colors visible. The transparency and screen were notably similar to the monochrome liquid crystal elements and overlay of ultra thin red, green, and blue color filter stripes that generate the color image in a typical LCD display. This invention was attributed to Irish scientist John Joly, who, like many inventors, discovered that the fundamental concept had been preemptively outlined in Louis Ducos du Hauron's 1868 patent, which had since expired.

Photographers differed in opinion about color photography when it was introduced. Some fully embraced it when it was available to the public in the late 1930s, while others remained skeptical of its relevance in photography.

Paul Outerbridge was an American photographer prominent for his early use and experiments in color photography. He began writing a monthly column on color photography for the U. S. Camera Magazine around 1930. Outerbridge became known for the high quality of his color illustrations, made by a highly complex tri color carbro process. In 1940 he published his seminal book Photographing in Color, using high quality illustrations to explain his techniques. Ferenc Berko, a photographer who lived during the introduction of color film, recognized a potential of color film. He saw it as a way to experiment with the subjects he photographed and how he conveyed emotion in the photograph. John Hedgecoe, another photographer who lived during the time period, was another example of those who adopted color photographs. He published a book entitled The Art of Color Photography, which explained the importance of understanding the

text=Special and often subtle relationships between different colors.|author=John Hedgecoe

He also described the psychological and emotional power of color on the viewer since certain colors, he argues, can make people feel a certain way.

Harold Baquet, for instance—a photographer who lived during the 1980's, known best for documenting New Orleans civil rights—was not keen on color. He preferred to take pictures mainly using black and white film. When asked about his reasoning for this preference during an interview, he replied,

text=The less is more. Sometimes the color distracts from the essential subject. Sometimes, light, line, and form is enough, allowing you to explore the sculptural qualities of that third dimension, that illusional dimension of depth. And it’s fun.|author=Harold Baquet

This aversion to color was due mainly to a fear of losing simplicity in his pictures. He worried that color gave the eye too much to take in.

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