Part 4 provides an overview of the history of PDF, and it shows you the inner workings of a PDF document. It explains the different parts of a PDF file: the header, the body, the cross-reference table, and the trailer. The body of a PDF file consists of a series of objects, and you’ll learn about the different types of objects in the Carousel Object System.
The three final chapters focus on stream objects. First you’ll learn more about the content stream of a page. You’ll learn about graphics state and text state, and about marked content. In the final chapter, you’ll learn how to deal with streams that contain images, fonts, file attachments, and rich media.