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Figure 3: Each created job defines an input folder the watched folder where PDF files are picked up from and output folders for files without errors, files with errors, files with warnings and so on. The preflight profile selected in the job defines which checks and fixes are going to be executed on processed files.
Often the most efficient way to preflight PDF files is integrated into a larger solution such as a delivery portal or web-to-print solution. These versions of the applications support all of the preflight capabilities and can automatically generate detailed reports in PDF or XML for further integration.
Net application. Integrating preflight using the SDK requires development resources but does allow for the closest integration in the end.
To view a list of available fixups, click the Select Single Fixups button. Use the menu to specify if you want to view all, your favorites, most recently used, most frequently used, or one of the available categories. Select a profile, check or fixup on the list to see its description.
Profiles are organized in groups that you can expand and collapse. Profiles with the gray wrench icon include fixups that can correct errors in your file. Note: You can also use the Find box to search for a profile, check, or fixup. Optional Select a profile or single check, expand Further Options and do any of the following, as needed: Specify whether to limit the inspection to visible layers.
Selecting this option disables any fixups.
Specify a page range for the inspection. If you selected a profile, click Analyze to run the inspection without fixing the errors or Analyze And Fix to identify and fix the problems.
If you selected a single check only, the Analyze option is available. If you selected a single fixup, click Fix to start a fixup.
Note: You can also double-click a profile in the list to run the preflight inspection. If you double-click the file, profiles that contain fixups apply the fixups. The maximum number of results for a document is You can specify no details, only important details, or all details.
You can click the Warning icon to see a list of the alerts.
Click Adjust to automatically adjust the settings for maximized reliability of the display of the selected PDF document. Check if the PDF contains white text set to overprint. Such text may be visible when the text is watched on-screen but it disappears in print. Very small text quickly becomes either illegible or difficult to print when it is colored.
GWG recommends to flag any files with text smaller or equal to 5 points 8 points for newsprint. When it is colored with 2 or more colorants, text should not be smaller than 9 points 10 points for newsprint. Fonts All fonts should be included in the PDF file. This is done to avoid that an incorrect font is used, which could lead to text becoming illegible or part of the text disappearing.
When a certain font is not available during the PDF creation, it typically gets replaced by Courier. To avoid printing a PDF with missing fonts, check that no Courier font is present in the file. Images Images need to have a certain minimum resolution to be printed at a good quality. The required resolution depends on the type of printing.
That is why the preflight process should check if all image resolutions exceed a minimum threshold value. GWG recommends rejecting files containing color and grayscale images with a resolution below ppi for newsprint and ppi for commercial offset work. For 1-bit images anything below ppi is considered unacceptable.
Many preflight applications can already give a warning when the image resolution gets dangerously close to these minimum values.
Images that have a resolution that is too high lead to bloated files that take longer to transmit or process. For newsprint GWG sets the maximum resolution to ppi for color or grayscale images and ppi for 1-bit images.
For commercial print using offset presses, the maximum resolution is set to ppi for color or greyscale images and ppi for 1-bit images. Defining a maximum resolution is somewhat controversial: if this problem gets resolved by downsampling images, this can cause issues with special types of images such as security elements.
Some users also argue that large file sizes are no longer the problem that they once were. From their point of view, the risks of downsampling exceed the advantages of limiting the file size. By checking if white line-art is set to overprint, you avoid that such images disappear on the final output. Theoretically, it is possible to put images that use 16 bits per channel in a PDF file.
This leads to bloated files that may cause rendering issues on older RIPs, without any real-world advantage in printing quality. Preflight can make sure no bit images are allowed.
Artwork If a design contains very thin lines, these may disappear on the printed result. Therefore it is best to check the minimum line weight, which depends on the intended printing process.
For newsprint and commercial offset printing, a minimum line thickness of 0. For screen printing, 0.