By John Whitington
Ultimately, this is an approachable creation to the commonly used transportable record layout. PDFs are all over the place, either on-line and in published shape, yet few humans reap the benefits of the helpful positive aspects or clutch the nuances of this layout. This concise e-book presents a hands-on travel of the world's major page-description language for programmers, strength clients, and pros within the seek, digital publishing, and printing industries. Illustrated with plenty of examples, this booklet is the documentation you must totally comprehend PDF.
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Extra info for PDF Explained: The ISO Standard for Document Exchange
Figure 2-1. Object graph for Hello, World! PDF, with object numbers in brackets from Example 2-1 Building the Elements We’ll type the PDF data into a text file. The line endings chosen by your text editor are unimportant (
Hello, World! PDF, viewed in the free Adobe Reader on Microsoft Windows Remarks We’ve seen how to build a simple PDF file from scratch, using pdftk to help us, and we’ve looked at some of the basic syntax that makes up a PDF document. You can look at existing PDF files using your text editor too. However, some of the data (such as the graphics operators making up the page content) is likely to be compressed and thus unreadable. The pdftk command can be used to decompress these sections for easier reading—see “Compression” on page 114.
The following recursive data structure, given in psuedocode, can hold a PDF object. pdfobject ::= | | | | | | | | | Null Boolean of bool Integer of int Real of real String of string Name of string Array of pdfobject array Dictionary of (string, pdfobject) array Array of (string, pdfobject) pairs Stream of (pdfobject, bytes) Stream dictionary and stream data Indirect of int For example, the object << /Kids [2 0 R] /Count 1 /Type /Pages >> might be represented as: Dictionary ((Name (/Kids), Array (Indirect 2)), (Name (/Count), Integer (1)), (Name (/Type), Name (/Pages))) Figure 3-1, shown earlier in the chapter, shows the object graph for the file in Example 3-1.