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screentone
Screentone is a technique for applying textures and shades to drawings, used as an alternative to hatching. In the conventional process, patterns are transferred to paper from preprinted sheets,〔Sharon Kinsella, ''Adult Manga: Culture and Power in Contemporary Japanese Society'', Routledge, 2000, p59. ISBN 0-7007-1003-5〕 but the technique is also simulated in computer graphics. It is also known by the common brand names Zip-A-Tone (1937, now defunct〔Manufacturer-supplied first use date for 〕), Chart-Pak (1949〔Manufacturer-supplied first use date for 〕), and Letratone (1966, from Letraset〔Manufacturer-supplied first use date for 〕).
A traditional screentone sheet consists of a flexible transparent backing, the printed texture, and a wax adhesive layer. The sheet is applied to the paper, adhesive down, and rubbed with a stylus on the backing side. The backing is then peeled off, leaving the ink adhered to the paper where pressure was applied.
==Motivation==
A screentone saves an artist's time by allowing quick application of textures to line art where a hand-shaded area would not be reproduced in a timely or acceptable manner. Much like halftone, the size and spacing of black dots, lines, or hatches determine how light or dark an area will appear. Visual artists need to take into account how much an image will be reduced when prepared for publication when choosing the pitch of a screentone. Screentones can also be layered to produce interference patterns such as moire effects, or to simulate multiple sources of shadow in an image.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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