PDF In-Depth

Navigating the Internal Structure of a PDF Document

Examples

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The Minimum PDF Document:

So far this article has covered some pretty hairy looking object structures. But the simplest PDF Document is really very simple. The figure below shows the complete COS level view of a PDF with a single blank page. That's all there is to it. When Acrobat saves this file it will however add a Metadata Stream to the Document Catalog. It can't help itself. Acrobat really wants that Metadata to be there, but it will still read and display the file with out it.

COS level view of blank PDF page


Figure 6. Minimum PDF

One Last Big Hairy Object:

Sometimes you may have to really look hard for the data you want. This last figure shows the depths to which some data is buried. This screen shot is of a Multimedia Object that is played by QuickTime. The Multimedia Object lives inside of an annotation. With the PDF Spec alone it would be very difficult to understand the structure of this object and locate the actual QuickTime movie data. But with a nice view of the object structure it's easy to get to the bottom of the document, literally.

A Multimedia Object played by QuickTime


Figure 7. The inspiration for this image was provide by Leonard Rosenthol: PDF Guru Extraordinaire.

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Ubiquitous PDF: Multi-format publishing with PDF

PDF publishing is mainstream these days, and it's certainly more efficient and eco-friendly than conventional distribution channels. Sometimes, though, it's a pleasure to sit down with a printed magazine, and many readers will never enjoy reading long items digitally. Magcloud is a self-publishing service which combines e-publishing with print-on-demand.

September 09, 2010
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