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3. PDF normalization
PDF normalization is the first process that a digital workflow needs to perform after receiving a file. Only through the standardized documents can the normal circulation and output in the later production process. The main function of PDF normalization is to convert the input source files of different formats into a standardized PDF file format in the process. At the same time, the file is further checked for pre-flight. Usually, the font information, image resolution and color mode need to be checked again. The result of correct and smooth passage should be that the generated normalized PDF file contains all the font information on the page, and the resolution of all graphics and images is 300dpi or more. The color modes are all in accordance with the printed CMYK mode.
(1) Page size
PDF normalization can reset the size of the input file. If there is a “default page size†option in the Refine template of the Kodak Prinergy workflow, the user can select the page size of the input file itself. Through normalization, you can also ignore the page size of the file itself, and redefine the page size in the Refine process. This size can be customized by the user according to your needs. In order to match the large version and meet the output requirements, the small page size should be the same as the small size set in the larger version.
(2) The font detection font problem has always been one of the more difficult solutions in the prepress process. The PDF normalized file must contain all the font information, so as to ensure that the font content in the file is intact in the back-end output. Normally, the normalization process provides further checks on the fonts while also providing solutions for missing fonts, whether to interrupt the normalization process or to use alternative fonts, depending on the user's requirements for file fonts. Generally, fonts are embedded into files or converted into curves at the front end, and the font process will no longer occur in the normalization process.
(3) Image Resolution and Color Mode Detection In order to obtain high-quality prints, the print image generally has a resolution of not less than 300 dpi, but different image resolutions may be set depending on the specific use of the print. The color mode of the print file is CMYK mode. The normalization process can check the resolution of the image in the file and its color mode to ensure that the print output requirements are met.
4. The emergence of digital layout digital layout software has completely eliminated the traditional process flow of hand-made imposition. It is a necessary part of the modern digital production process. The major version is to solve the problem of folding, that is, how to arrange smaller pages in a layout.
In the transmission process of the prepress data stream, the digital layout link determines the production control information such as the large print size, printing method, cutting line, register line, style and position of the folding line, and controls these operations. The information is transmitted to the post-press processing equipment accurately, and the printed product that meets the requirements can be obtained.
Current digital workflows typically receive large-scale scenarios generated by Preps or Signastation imposition software (Founder Streamflow combines text and composer software together). The imposition plan is imported into the process in the file format of PJTF or JDF and smoothly circulated therein. Take Preps imposition software as an example.
(1) Binding style and printing method The binding style of the printed product determines the order in which the pages are discharged into the large-sized stencil, that is, the binding style determines the folding method. Preps offers 5 kinds of binding styles, including free-binding, glue-binding, saddle-stitching, twin-joint and single-joint. Users can choose different binding styles according to the requirements of printed products. As shown in Figure 7, Preps provides the binding options.
The choice of printing method depends on how the job will run on the press. When print jobs appear to be non-sticking, in order to save the cost of printing plates, it is often necessary to create a large version of the template in a variety of printing methods so that each page meets the requirements of the whole paste. Preps offers a variety of printing methods, including stencil printing, self-turning, flip, single-sided printing, and double-sided printing. Figure 8 shows the printing options offered by Preps.
(2) The most important thing in several layout size digital layouts is to understand the layout dimensions and the relationship between them. Small size refers to the finished product size. The large print size refers to the print sheet size, which is the size of the printed paper. The device page size refers to the page size supported by the output device, ie the film size or the plate size, which is determined by the output device. The relationship between the three layout sizes is shown in Figure 9. To set the bleeding size for smaller pages, the paper size increases accordingly.
(3) Various control marks
Preps uses two template marks, one is SmartMark, which can be placed and resized dynamically; the other is a static mark whose position is determined by coordinates. Adding various control marks on the large version is to monitor the printing process and the post-printing process, such as cutting marks, folding marks, labeling, and color measuring bars. These control information will guide the back-end printing and post-press processing equipment how to work, and provide data basis for its accurate operation.
5. Post-RIP Output Current popular digital workflows include integrated or separate RIP processors. After importing the imposition plan, put the normalized stand-alone PDF small version page into the large version plan. The integrated large-scale page needs to be processed by RIP first, and the layout content information is converted into record data that can be recognized by the output device before the large-format version can be output. The RIP in the process supports different back-end outputs, such as output film, computer-to-plate, digital proofing, and digital printing. The key settings for RIP output are the following two.
(1) Screening Parameters Screening parameter settings mainly include the dot shape, screen number, screen angle, and output device resolution. The operator must select the appropriate screening parameters based on the quality requirements of the printing job and its use. Some process software can call the dot gain compensation curve to output a printing plate that is more in line with printing requirements, such as Prinergy, Founder, etc.
(2) Large-size output size The final large-size output size depends on the type of output device. This size must be consistent with the large-size size set in the large-format version, so that the correct output can be achieved under the premise of quality assurance. You can also set cutting marks, bleeding lines, and other control marks when outputting. If the operator has added various control marks to the large version of the program, the output does not have to be set repeatedly.
The establishment and application of the data flow control method can make the prepress variables variable, give full play to the advantages of the digital process, and reduce the cost, efficiency, and profit of the printing workflow.
Source: Digital Printing
PDF normalization is the first process that a digital workflow needs to perform after receiving a file. Only through the standardized documents can the normal circulation and output in the later production process. The main function of PDF normalization is to convert the input source files of different formats into a standardized PDF file format in the process. At the same time, the file is further checked for pre-flight. Usually, the font information, image resolution and color mode need to be checked again. The result of correct and smooth passage should be that the generated normalized PDF file contains all the font information on the page, and the resolution of all graphics and images is 300dpi or more. The color modes are all in accordance with the printed CMYK mode.
(1) Page size
PDF normalization can reset the size of the input file. If there is a “default page size†option in the Refine template of the Kodak Prinergy workflow, the user can select the page size of the input file itself. Through normalization, you can also ignore the page size of the file itself, and redefine the page size in the Refine process. This size can be customized by the user according to your needs. In order to match the large version and meet the output requirements, the small page size should be the same as the small size set in the larger version.
(2) The font detection font problem has always been one of the more difficult solutions in the prepress process. The PDF normalized file must contain all the font information, so as to ensure that the font content in the file is intact in the back-end output. Normally, the normalization process provides further checks on the fonts while also providing solutions for missing fonts, whether to interrupt the normalization process or to use alternative fonts, depending on the user's requirements for file fonts. Generally, fonts are embedded into files or converted into curves at the front end, and the font process will no longer occur in the normalization process.
(3) Image Resolution and Color Mode Detection In order to obtain high-quality prints, the print image generally has a resolution of not less than 300 dpi, but different image resolutions may be set depending on the specific use of the print. The color mode of the print file is CMYK mode. The normalization process can check the resolution of the image in the file and its color mode to ensure that the print output requirements are met.
4. The emergence of digital layout digital layout software has completely eliminated the traditional process flow of hand-made imposition. It is a necessary part of the modern digital production process. The major version is to solve the problem of folding, that is, how to arrange smaller pages in a layout.
In the transmission process of the prepress data stream, the digital layout link determines the production control information such as the large print size, printing method, cutting line, register line, style and position of the folding line, and controls these operations. The information is transmitted to the post-press processing equipment accurately, and the printed product that meets the requirements can be obtained.
Current digital workflows typically receive large-scale scenarios generated by Preps or Signastation imposition software (Founder Streamflow combines text and composer software together). The imposition plan is imported into the process in the file format of PJTF or JDF and smoothly circulated therein. Take Preps imposition software as an example.
(1) Binding style and printing method The binding style of the printed product determines the order in which the pages are discharged into the large-sized stencil, that is, the binding style determines the folding method. Preps offers 5 kinds of binding styles, including free-binding, glue-binding, saddle-stitching, twin-joint and single-joint. Users can choose different binding styles according to the requirements of printed products. As shown in Figure 7, Preps provides the binding options.
The choice of printing method depends on how the job will run on the press. When print jobs appear to be non-sticking, in order to save the cost of printing plates, it is often necessary to create a large version of the template in a variety of printing methods so that each page meets the requirements of the whole paste. Preps offers a variety of printing methods, including stencil printing, self-turning, flip, single-sided printing, and double-sided printing. Figure 8 shows the printing options offered by Preps.
(2) The most important thing in several layout size digital layouts is to understand the layout dimensions and the relationship between them. Small size refers to the finished product size. The large print size refers to the print sheet size, which is the size of the printed paper. The device page size refers to the page size supported by the output device, ie the film size or the plate size, which is determined by the output device. The relationship between the three layout sizes is shown in Figure 9. To set the bleeding size for smaller pages, the paper size increases accordingly.
(3) Various control marks
Preps uses two template marks, one is SmartMark, which can be placed and resized dynamically; the other is a static mark whose position is determined by coordinates. Adding various control marks on the large version is to monitor the printing process and the post-printing process, such as cutting marks, folding marks, labeling, and color measuring bars. These control information will guide the back-end printing and post-press processing equipment how to work, and provide data basis for its accurate operation.
5. Post-RIP Output Current popular digital workflows include integrated or separate RIP processors. After importing the imposition plan, put the normalized stand-alone PDF small version page into the large version plan. The integrated large-scale page needs to be processed by RIP first, and the layout content information is converted into record data that can be recognized by the output device before the large-format version can be output. The RIP in the process supports different back-end outputs, such as output film, computer-to-plate, digital proofing, and digital printing. The key settings for RIP output are the following two.
(1) Screening Parameters Screening parameter settings mainly include the dot shape, screen number, screen angle, and output device resolution. The operator must select the appropriate screening parameters based on the quality requirements of the printing job and its use. Some process software can call the dot gain compensation curve to output a printing plate that is more in line with printing requirements, such as Prinergy, Founder, etc.
(2) Large-size output size The final large-size output size depends on the type of output device. This size must be consistent with the large-size size set in the large-format version, so that the correct output can be achieved under the premise of quality assurance. You can also set cutting marks, bleeding lines, and other control marks when outputting. If the operator has added various control marks to the large version of the program, the output does not have to be set repeatedly.
The establishment and application of the data flow control method can make the prepress variables variable, give full play to the advantages of the digital process, and reduce the cost, efficiency, and profit of the printing workflow.
Source: Digital Printing
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