File:The American annual of photography (1919) (14596033057).jpg

Identifier: americanannualof3334newy (find matches)
Title: The American annual of photography
Year: 1919 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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t on the negative by light passingthrough the screen before striking the negative, and this inturn is necessary to obtain a final broken or dotted effect onthe positive metal or other printing plate in order to producethe well known halftones. Now, instead of glass screens which are universally em-ployed at present, I will proceed to describe how I have madeflexible screens, their use and oftentimes advantages over theglass screens, as follows: A screen is produced on an ordinary film negative in thecamera by photography. The object from which this photo-graph is made may be of great variety, for instance: white netlaces or veilings put on a black background, printed calicoes,or cretonnes, or other materials with different patterns in blackon white background, or vice versa, or in colors, or differentshaped wire screens, etc., in short anything that, when photo-graphed will produce a screen effect. The shape of the indi-vidual parts of the screen of course can be made to vary from 126
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wop Pi OO 127 squares to round shapes, or any irregular form (dependingonly on the pattern of the original object photographed) so as toform any kind of a grain or lines when printed therefrom ontothe positive; the size of the grain can be made coarser or finerby having the camera nearer or further away from the screenmaterial object respectively when photographing same. Thescreen photographed on the film is developed and fixed like anordinary negative. A film pack so called can be very well em-ployed, or a roller film, or even the present day single portraitfilms for professionals. Of course the main requisite is thatthe film is flat and level and parallel at all points to the objectto be photographed. The benefit of these film screens over the glass screens inmany instances are numerous: First: When glass screens are employed for process workit is necessary to use a complicated and expensive processcamera with special screen attachment, as the picture is takenin the camera through t

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