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Rayographs : ウィキペディア英語版
Photogram

A photogram is a photographic image made without a camera by placing objects directly onto the surface of a light-sensitive material such as photographic paper and then exposing it to light. The usual result is a negative shadow image that shows variations in tone that depends upon the transparency of the objects used. Areas of the paper that have received no light appear white; those exposed through transparent or semi-transparent objects appear grey.
The technique is sometimes called cameraless photography. It was used by Man Ray in his exploration of rayographs. Other artists who have experimented with the technique include László Moholy-Nagy, Christian Schad (who called them "Schadographs"), Imogen Cunningham and Pablo Picasso.〔According to Alexandra Matzner in ''Christian Schad 1895-1982 Retrospectief'' issued by the Gemeentemuseum Den Haag (2009), ISBN 978-3-87909-974-0, p. 216, Schad was the first ''artist'' to use the photogram technique, developed by William Henry Fox Talbot. The photogram was applied by Man Ray, Moholy-Nagy and Chargesheimer after its introduction by Christian Schad, according to the author. However, this is not substantiated through further reference by Matzner. The Dutch catalogue was also issued in German by the Leopold Museum in Vienna (2008).〕 Variations of the technique have also been used for scientific purposes.
==History==

Some of the first photographic images made were photograms. William Henry Fox Talbot called these ''photogenic drawings'', which he made by placing leaves and pieces of material onto sensitized paper, then left them outdoors on a sunny day to expose. This produced a dark background with a white silhouette of the object used.
From 1843, Anna Atkins produced a book titled ''British Algae: Cyanotype Impressions'' in installments; it was the first book to be illustrated with photographs. The images were all photograms of botanical specimens, which she made using Sir John Herschel's cyanotype process, which yields blue images.
〔(【引用サイトリンク】title=Anna Atkins )〕 This very rare book can be seen in the National Media Museum in Bradford, England.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Photogram」の詳細全文を読む



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