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Post Script is a page description language run in an interpreter to generate an image, a process requiring many resources.It can handle graphics and standard features of programming languages such as remain.Any files, graphics, or fonts to which the document refers also are collected. Therefore, the entire Post Script world (fonts, layout, measurements) remains intact.As a document format, PDF has several advantages over Post Script: ). Objects may be either direct (embedded in another object) or indirect.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.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.
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.These proprietary technologies are not standardized and their specification is published only on Adobe’s website.Many of them are also not supported by popular third-party implementations of PDF.This technique reduces the size of files that have large numbers of small indirect objects and is especially useful for Tagged PDF.At the end of a PDF file is a trailer introduced with the There are two layouts to the PDF files: non-linear (not "optimized") and linear ("optimized").