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Often, the Post Script-like PDF code is generated from a source Post Script file.The graphics commands that are output by the Post Script code are collected and tokenized.Non-linear PDF files consume less disk space than their linear counterparts, though they are slower to access because portions of the data required to assemble pages of the document are scattered throughout the PDF file.Linear PDF files (also called "optimized" or "web optimized" PDF files) are constructed in a manner that enables them to be read in a Web browser plugin without waiting for the entire file to download, since they are written to disk in a linear (as in page order) fashion.PDF was standardized as ISO 32000 in 2008, and no longer requires any royalties for its implementation.Today, PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content) and three dimensional objects using U3D or PRC, and various other data formats.Post Script is a page description language run in an interpreter to generate an image, a process requiring many resources.
Beginning with PDF version 1.5, indirect objects may also be located in special streams known as object streams.
PDF files may be optimized using Adobe Acrobat software or QPDF.
The basic design of how graphics are represented in PDF is very similar to that of Post Script, except for the use of transparency, which was added in PDF 1.4.
The Portable Document Format (PDF) (redundantly: PDF format) is a file format developed by Adobe in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.
Based on the Post Script language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it.