The development of PDF began in 1991 when John Warnock wrote a paper for a project then code-named Camelot, in which he proposed the creation of a simplified version of PostScript called Interchange PostScript (… See more

A PDF file is often a combination of vector graphics, text, and bitmap graphics. The basic types of content in a PDF are:
• Typeset text stored as content streams (i.e., not encoded in plain text);
• Vector graphics fo… See more

A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for … See more

The basic design of how graphics are represented in PDF is very similar to that of PostScript, except for the use of transparency, which was added in PDF 1.4.
PDF graphics use a device-independent Cartesian c… See more