...In this way, the screen functions to change the shades of a photograph into large and small halftone dots. There are two types of screens: contact screens and glass screens. The former is a plastic film with gradated halftone dots, while the latter is also called an intersection screen, and is a glass plate with a grid of intersecting black opaque straight lines. When a contact screen is placed in close contact with a photosensitive plate and a photograph of an original is taken, a so-called halftone negative is created, with large halftone dots in the light areas of the original and small halftone dots in the dark areas. ... *Some of the terminology that mentions "glass screen" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このように,写真の濃淡を大小の網点に変える働きをスクリーンがもっている。スクリーンにはコンタクトスクリーンとガラススクリーンの2種があり,前者はプラスチックフィルムにぼかし網点を設けたもの,後者は交線スクリーンともいって,ガラス板に黒い不透明の直線が交差した格子状に入ったものである。コンタクトスクリーンを感光板に密着して原稿の写真を撮影すると,原稿写真の明るいところは大きな網点,暗いところは小さな網点となったいわゆる網ネガティブができる。… ※「ガラススクリーン」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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