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Currently there is no complete set of DTP digital exchange standards, and many special file formats or programming language specifications have become the standard in practical applications. There are many options or extensions for this, and each combination may be extremely unique. Although Postscript code is an exchange format that is commonly created by these proprietary formats and application software, other formats can be generated to exchange files. In addition, many intermediary digital file formats have emerged, and PDF has become a common file format, and the CGATS is preparing to define a standard for applying PDF to printing technology.
TIFF/IT
The exchange of electronic files between CEPS and CEPS can be successfully implemented in the TIFF/IT P1 file format. ISO 12639 also defines the TIFF/IT P1 file format. This work is an extension of IT 8.8-1993, Graphics Technology - Prepress Digital Data Exchange - TIFF/IT. The TIFF/IT format is a file format designated by SWOP for the exchange of electronic documents in magazine publishing, and is particularly desirable in workflows using multiple printing sites.
All continuous tone (CT) pictures in the CEPS or system platform DTP and CEPS formats are stored as continuous tone raster data (pixel information on a rectangular grid is used to represent the tonal value on the picture). Since each pixel's yellow, magenta, cyan, and black tone values ​​require four bytes to record (one byte for each color), the picture file is relatively large. The only way to reduce files is through data compression.
Art line (LA), sometimes referred to as line art (LW), refers to the "raster" description of line art, text, and other non-graphic information. This requires the use of color tables or print volume coding for palettes and repeating elements. The electronic files thus formed are much smaller than those in the same physical space.
The third file format, high-resolution continuous tuning (HC), is mainly used to provide HC data data in picture edge areas and overprint areas of text and pictures. It also requires the coding of the repetitive elements, and the file is relatively small.
Since these files describe the physical images electronically, they must be edited using traditional CEPT technology. This includes file replacement and/or electronic cutting and pasting.
Desktop Platforms Desktop platforms are also commonly referred to as DTP platforms, and raster files and vector format files are often used in electronic page layout. This makes it easy to edit text and line art elements, and can postpone the final page description to the output image step.
The scanned picture data is stored as a raster file in the same storage as the CEPS system. These files are common in both architectures. The text "object-oriented" description uses strings, and each character defines information that identifies the outline of the font. The outline of these fonts is mainly represented by the image drawing sequence and raster. (Font information is also embedded in the file.) The order in which the images are drawn in these object-oriented descriptions is based primarily on geometric information (drawing the lines, curves, and other shapes accurately on the XY axes). These description files contain less dense data and are therefore smaller than line raster files.
In order to reach the final output device, you can use vector software to create a Postscript data stream and send it to the output device. Usually Postscript files are not editable, and because it uses the unique features of the output device, the usual Postscript file is often targeted to a specific output device. (To be continued)
Electronic document generation and exchange (middle)
The DTP platform uses a dedicated page imposition format and page description language to treat text, line drawings and pictures as different image "objects", each with a different representation, such as a scanned picture as a raster file, text As a positioned character string plus a scalable font, line drawings (graphics) are treated as vector files. This method is more straightforward and easier to edit the layout pages. It is very simple to replace individual elements in this way. In addition, the authoring process of this method has nothing to do with the final rasterization device, and the editing flexibility is large and the generated files are small. The main difference between these two methods is the degree of restrictions on specific output devices.