photoengraving


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photoengraving,

photomechanical process in the graphic arts, used principally for reproducing illustrations. The subject is photographed, and the image is recorded on a sensitized metal plate, which is then etched in an acid bath. In the case of line cuts (drawings in solid blacks and whites without gradations of color), the photoengraving is done on zinc, and the result is called a zinc etching. In the case of halftone cuts, the work is done on copper. The halftone effect is accomplished by photographing the subject through a wire or glass screen, which breaks the light rays so that the metal plate is sensitized in a dotted pattern; the larger dots create the darker areas, the smaller dots the high lights. The finer the screen, the greater the precision of detail in the printed product. Halftones made with a screen having 65 lines to the inch are considered coarse. Those having 150 lines to the inch are considered fine.

photoengraving

[¦fōd·ō·in′grāv·iŋ]
(graphic arts)
The technique of producing relief plates such as halftones or zinc etchings by photography; a metal plate is coated with a photosensitive emulsion and exposed to light under a reversed positive; the picture is developed by dissolving away the portion of the emulsion not acted upon by the light, and the plate is etched.
References in periodicals archive ?
Not only was Byron & May known for its high-quality photographic images--many of which were licensed to Alberta-based newspapers and publishers--they also operated a photoengraving plant.
With its two forty-horse-power steam engines, elevators, photoengraving department, library and reading rooms, administrative offices and richly decorated reception rooms, Eusebio Blasco described the new plant as a palace dedicated to modernity: "This Blanco y Negro palace, these thousands of duros spent on such staircases, galleries, and office salons, whose engravings appear in these pages, represent the triumph, the apotheosis of the modem chronicle and graphics." By this time the magazine boasted a workforce of 105 employees and 750 contracted agents, and its inventory of resources dwelled on the advantages of its happy "family" of workers.
Photoengraving, radio, and television have made it possible for advertising to create product-extrinsic appeal through arresting visual imagery, dramatic slice-of-life vignettes, and music.
Technological developments included use of the rotary press, stereotype plates, and photoengraving. (19) These advances gave an advantage to the new publishers aiming for large audiences.
Occupations in other fields that are expected to be equally promising include paralegals; airplane pilots and flight engineers; flight attendants; reservation and transportation ticket agents and travel clerks; lithography and photoengraving workers, precision; and operating engineers.
The frames are available from Caseco and are treated with an exclusive photoengraving technique, resulting in a rich polished finish, which fuses colour gradations and pictorial asymmetrical patterns directly into the stainless steel.
For many years Tom owned and operated the photoengraving businesses Worcester Engraving Company and Printing Plates Inc., in the Printers Building in Worcester.
Steel embossing dies are made in a couple of different ways: CNC machining, EDM (electric discharge machining), and photoengraving. EDM is an electric etching process, and photoengraving involves transfer of the image to the cylinder photographically, followed by chemical etching.
"Some of the skills we had in our photoengraving departments were too good to let go," Farrington said.