Color Printing

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color printing

[′kəl·ər ‚print·iŋ]
(graphic arts)
The art and craft of embellishing designs, pictures, and typographic pages with color for a more pleasing effect than obtained in black and white; in addition, pictures more closely represent the original object or painting.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Color Printing

 

a method of reproducing multicolored images of paintings, color photographs, and the like on paper, cloth, or other materials. It is achieved by means of special plates, usually equal in number to the number of printing inks used. Normally, three are used: yellow, blue, and purple (three-color printing); however, frequently the three are insufficient to print dark colors, and it is necessary to resort to a fourth, which may be black or gray. Sometimes a fourth color is used to print a particular hue, such as turquoise or lilac. In such cases the process is known as four-color printing. In offset, which involves thin ink layers in impressions, the saturation of the prints is enhanced by introducing extra colors, such as dark blue and red.

In order to prepare each plate, color-separated negatives must be obtained. Color separation is achieved by photographing the original through color filters (transparent colored films or glass) that pass only the correspondingly colored rays reflected from the original. The filters usually used are blue-violet, red, and green, which pass, respectively, light blue, purple, and yellow rays. The original is photographed through a screen in order to print gradations of color. A multicolored print is obtained by the successive transfer of the appropriate colors from the plates to a sheet of paper, with the outlines of the images accurately superposed (in register). The eye perceives a single composite color, or hue, depending on which of the inks predominates in a given part of the image. The printing may be done on a multicolor press in one stage or on a single-color press in several stages.

Color distortions in color-separated negatives are removed in various ways, depending on the type of printing and the purpose of the print. The correction may be done directly on the color-separated printing plates by etching (for letterpress printing) or on the negatives and diapositives by a manual method, a photomechanical method, or an automatic method using electronic apparatus (seeREPRODUCTION PROCESSES). Color separation and color correction may also be performed simultaneously by automated systems, some of which provide finished color-separated printing plates directly from an original without the photographing and copying processes.

Apart from the selection of inks having suitable optical properties, the attainment of bright, saturated, multicolored prints is ensured by the use of very smooth grades of paper that have superior gloss and whiteness. Paper used for color printing is acclimatized to prevent appreciable linear distortion of the sheets, thereby facilitating proper registration of the separate images.

REFERENCES

Popriadukhin, P. A. Tekhnologiia pechatnykh protsessov. Moscow, 1968.
Siniakov, N. I. Tekhnologiia izgotovleniia fotomekhanicheskikh pechatnykh form, 2nd ed. Moscow, 1974.

I. A. ZHUKOV

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Xerox Iridesse Production Press is a high-speed, six-station colour press that combines four-colour printing with up to two speciality dry inks in one printing pass.
The Xerox Iridesse Digital Printing Press is a high-speed, six-station colour press that combines four-colour printing (CMYK) with up to two specialty dry inks in one printing pass.
Geometric shapes, fine outlines and four-colour printing are best with Nova 195ED (115 micron thickness 16% open area) or Nova 195HD (115 micron thickness, 19% open area).
In addition to four-colour printing, we are also able to use special colours and spot colours for selected printed materials.
When Brian Wildsmith's publishers took advantage of the new and less expensive four-colour printing technology in the UK 50 years ago and began to produce picture books with the kind of ebullient palette we take for granted today, it was Anne who saw the possibilities in this new technology for Australia (Desmond Digby's Waltzing Matilda Book of the Year 1971).
The facility, which includes a new four-colour printing press and other equipment and machinery, will allow the company to expand into new markets and increase productivity.
Because the four-colour machine is more automated we can change from one design to another more quickly than with existing equipment." This exposition of the benefits of four-colour printing is followed by a discourse on the advantages of the new "curing" technology originally done in a thermal oven now done by a bank of ultra violet lights.