| 翻訳と辞書 |
| chromolithography ： ウィキペディア英語版 |
chromolithography
Chromolithography is a method for making multi-colour prints. This type of colour printing stemmed from the process of lithography, and it includes all types of lithography that are printed in colour.〔“Planographic Printing.” ''Seeing is Believing''. 2001. The New York Public Library. 11 April 2007 .〕 When chromolithography is used to reproduce photographs, the term photochrome is frequently used. Lithographers sought to find a way to print on flat surfaces with the use of chemicals instead of relief or intaglio printing.〔“Chromolithography and the Posters of World War I.” ''The War on the Walls''. Temple University. 11 April 2007 .〕
Chromolithography became the most successful of several methods of colour printing developed by the 19th century; other methods were developed by printers such as Jacob Christoph Le Blon, George Baxter and Edmund Evans, and mostly relied on using several woodblocks with the colours. Hand-colouring also remained important; elements of the official British Ordnance Survey maps were coloured by hand by boys until 1875. The initial technique involved the use of multiple lithographic stones, one for each colour, and was still extremely expensive when done for the best quality results. Depending on the number of colours present, a chromolithograph could take months to produce, by very skilled workers. However much cheaper prints could be produced by simplifying both the number of colours used, and the refinement of the detail in the image. Cheaper images, like advertisements, relied heavily on an initial black print (not always a lithograph), on which colours were then overprinted. To make an expensive reproduction print as what was once referred to as a “’chromo’”, a lithographer, with a finished painting in front of him, gradually created and corrected the many stones using proofs to look as much as possible like the painting in front of him, sometimes using dozens of layers.〔Clapper, Michael. “’I Was Once a Barefoot Boy!’: Cultural Tensions in a Popular Chromo.” American Art 16(2002): 16-39.〕
==Process==
The process of chromolithography is chemical, because an image is applied to a stone or zinc plate with a grease-based crayon. (Limestone and zinc are two commonly used materials in the production of chromolithographs.) After the image is drawn onto stone, the stone is gummed with gum arabic solution and weak nitric acid, and then inked with oil-based paints and passed through a printing press along with a sheet of paper to transfer the image to the paper. Colours may be added to the print by drawing the area to receive the colour on a different stone, and printing the new colour onto the paper. Each colour in the image must be separately drawn onto a new stone or plate and applied to the paper one at a time. It was not unusual for twenty to twenty-five stones to be used on a single image.〔“Chromolithography.” ''Beautiful Birds Exhibit''.1999. Cornell University Library. 11 April 2007 .〕 Each sheet of paper will therefore pass through the printing press as many times as there are colours in the final print. In order that each colour is placed in the right position in each print, each stone or plate must be precisely ‘registered,’ or lined up, on the paper using a system of register marks.〔
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「chromolithography」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|