Layout positioning of PDF pages in layout
1. Large layout structure
The large-format layout structure is determined according to many factors such as the size of the printing press, the size of the printing plate, the size of the paper, and the structure of the PDF page. The large-format layout structure defined in the Signastation software, including plate bite, paper bite, home page (PDF page), binding line, cutting line and various marks. The home page is used for the layout positioning of the PDF page on the large version, which is divided into a left home page and a right home page. The home page size is determined by the actual size (finished size) and bleeding size.
2. Positioning of PDF pages
According to the PDF page structure, define the type of homepage in the layout software and determine the page positioning method, including the setting of the homepage type, actual size (finished size) and bleeding size, page displacement size With directions etc.
For different PDF page structures, there are two page positioning solutions in Signastation: automatic and user-defined.
â‘ Automatic: The system will automatically place the pages into the large version file according to the PDF page structure. The rules are as follows:
If the PDF page contains a TrimBox, then align the lower left corner of the Trim Box with the lower left corner of the finished size of the homepage; if there is no TrimBox and there is a CropBox, then Align the bottom left corner of the crop box (CropBox) with the bottom left corner of the finished product of the homepage; if there is no crop box (TrimBox) and crop box (CropBox), and there is a media box (MediaBox), the bottom left corner of the media box Align with the lower left corner of the actual size of the homepage.
â‘¡User definition: Allow users to accurately position PDF pages by setting page offsets. The most important parameter here is the offset (Offset). Offset refers to the offset of the origin of the PDF page relative to the origin of the homepage of the large version. There are three methods for setting.
From the crop box: The crop box here refers to TrimBox. At this time, the origin of the coordinates of the PDF page is in the lower left corner of the cutting frame, and the origin of the home page is in the lower left corner of the finished size. The layout system can automatically identify the origin of the coordinates and align it without displacement. This method is equivalent to the "automatic" method.
Centered: The PDF page is placed on the home page in a centered form, which is suitable for PDF pages with consistent bleeding on all sides.
Custom: It is mainly used when the PDF page is not set with irregularities such as cropping frame and bleeding frame. Need to set the displacement in the X and Y directions to achieve the positioning of the PDF page.
Offset in X direction (OffsetX): The distance that the origin of the PDF page is offset from the origin of the homepage in the X direction (horizontal direction). Offset in Y direction (OffsetY): The distance that the origin of the PDF page is offset from the origin of the homepage in the Y direction (horizontal direction).
3. Examples of page positioning
Take the spread-page file as an example. Assuming that the finished product size is 210 × 285mm, the PDF page is a spread file, the single page is bleeding on three sides, and each side is 3mm, then the PDF spread file size is 426 × 582mm, and the PDF page does not have a trim box (TrimBox). There are two ways to deal with this type of page in the layout:
①Method one: Split the cross-page file into a single-page file, set the left and right home pages for the single-page file, and perform the displacement in the X and Y directions. The split page is bleed on three sides, and its size is 213 × 291mm; the displacement of the left page is (X: -3mm, Y: -3mm), and the displacement of the right page is (X: 0mm, Y: -3mm).
② Method two: Do ​​not split the cross-page file, use displacement to locate directly. At this time, the displacement value of the left page is (X: -3mm, Y: -3mm), and the displacement value of the right page is (X: -213mm, Y: -3mm).
For other PDF page structures, different page positioning methods need to be adopted, which increases the variability and complexity of the imposition job, reduces the reliability of the imposition job, and thus affects the normal progress of post-press processing operations. Therefore, how to standardize the structure of PDF pages, simplify layout work, and improve reliability and efficiency are issues that deserve attention in prepress operations.
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