For curious people, this page takes a closer look at the way information is stored in a PDF file. If data are appended to a PDF-file for instance because the user edited text in Adobe Acrobat and saved the file again or if you merge PDF files , another body area, cross-reference table and trailer are added to the end of the file.
This bloats the PDF file size. The same is true when deleting pages in a PDF: only when you force the application to regenerate a new file will it clean up unused data.
Every line in a PDF can contain up to characters. Every line ends with a carriage return, a line feed or a carriage return followed by a line feed depending upon the application or platform used to create the PDF file.
Import a simple ASCII file into a job
PDF is case sensitive. The file format is completely independent from the platform that it is viewed or created on. Files can be moved back and forth between Macs, Windows system, Linux systems,… When FTP-ing a PDF file, it does make sense to compress it, to avoid data corruption by some outdated web system that the file needs to go through. The body area which contains a description of the various elements that are placed on the pages.
A cross-reference table which refers to all the elements from the body that are used on the pages of the PDF-file. This is not the case withPostScript files. If the last few lines of a PostScript file are missing because of a lost connection while transferring the file or a computer crash you can often still print most of the pages.
A coordinate system is used to define where each mark is placed. By default coordinates are defined in points 72 units per inch but this measurement system can be redefined within a PDF. The origin is in the bottom left but this 0,0 coordinate can also be redefined.
Marks can have a number of characteristics: a fill a stroke a color, which can be defined in one of the color spaces that PDF supports 11 in the most recent versions a certain level of transparency from PDF 1. Modifying data in a PDF If data are appended to a PDF-file for instance because the user edited text in Adobe Acrobat and saved the file again or if you merge PDF files , another body area, cross-reference table and trailer are added to the end of the file.
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PDF file structure
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