...When the halftone negative is contact printed onto new film, the darker parts of the original become larger halftone dots, and the lighter parts become smaller halftone dots. This is called a halftone positive, and when a letterpress plate is made based on the halftone positive, it looks like b in the figure, and when printed, it looks like c. The figure is an enlargement, and the actual mesh is about 100 to 120 lines per inch (about 2.5 cm) for letterpress and 100 to 200 lines per inch for offset, so the printed product will have a variety of shading. ... *Some of the terminology explanations that refer to "net positive" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…網ネガティブを新しいフィルムに密着焼きすれば,原稿の濃い部分は大きな網点に,淡い部分は小さな網点となる。これを網ポジティブといい,網ポジティブをもとに凸版の版面を作ると図のbのようになり,印刷するとcのようになる。図は拡大したもので,実際の網目は1インチ(約2.5cm)当り凸版で100~120線,オフセットで100~200線くらいのものを使っており,印刷物は濃淡のある画像となる。… ※「網ポジティブ」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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