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Method for converting portable document format file to compound color from presort color

A document format, composite color technology, applied in graphics and image conversion, instruments, calculations, etc., can solve problems such as recording, and achieve the effect of improving use efficiency and consistent accuracy

Inactive Publication Date: 2005-06-01
BEIJING FOUNDER ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] At present, no relevant documents, documents, patents, etc. have been found to record the method of pre-separation color conversion of PDF files described in the present invention

Method used

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  • Method for converting portable document format file to compound color from presort color

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing:

[0029] Such as figure 1 As shown, a method for pre-separation color conversion of a Portable Document Format file comprises the following steps:

[0030] (1) Concatenate the content objects of all pages in the pre-separation PDF file into the content object of the only page in the composite color PDF file. The content (Contents) objects in the page are interpreted and reassembled, and all resource objects of the PDF are also renamed and organized. Therefore, there must be a front-end PDF interpreter and a back-end PDF generator in the implementation structure of this conversion;

[0031] (2) Set the global overprint parameters. When splicing starts, you must first set the global overprint parameters in the graphics state at the starting position of the content (Contents) object of the composite color PDF file to ensure the op, OP and OPM parameters in the global overprint ...

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PUM

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Abstract

The present invention belongs to the field of computer graph and image processing technology, and is especially the method of converting pre-separated color PDF file into complex color PDF file. In available technology, pre-separated color PDF file can not be used in making-up and impose page in printing process and the complex color effect of pre-separated color PDF file can not be pre-viewed. The present invention is superposing principle process of converting pre-separated color PDF file into complex color PDF file. The converted complex color PDF file may be used directly in making-up and impose page of printing process to raise the efficiency and makes it possible for the user to pre-view the complex color effect of pre-separated color PDF file. In addition, the created complex color file has the same accuracy as the original pre-separated color PDF file during color grating output.

Description

technical field [0001] The invention belongs to the field of computer graphics and image processing, and in particular relates to a method for converting pre-separation color to composite color of a portable document format file. Background technique [0002] PDF (Portable Document Format, Portable Document Format) is a general-purpose file format defined by Adobe Corporation of the United States. It can retain the fonts, images, and graphics of any source document regardless of the applications and platforms used to create the source document. and layout settings. PDF is built on the basis of Adobe PS (PostScript, page description language), and continues to use the underlying imaging model described by PS. Currently, the PDF file format has become the world's de facto standard for securely and reliably distributing and exchanging electronic documents and electronic forms. [0003] A pre-separated PDF file is a special type of PDF file in which each page is described in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T3/00
Inventor 王伟
Owner BEIJING FOUNDER ELECTRONICS CO LTD
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