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The Portable Document Format PDF is a file format used to present documents in a manner independent of application software, hardware, and operating systems. Each PDF file encapsulates a complete description of a fixed layout flat document, including the text, fonts, graphics, and other information needed to display it. History and standardizationeditPDF was developed in the early 1. It was among a number of competing formats such as Dj. Vu, Envoy, Common Ground Digital Paper, Farallon Replica and even Adobes own Post. Script format. In those early years before the rise of the World Wide Web and HTML documents, PDF was popular mainly in desktop publishingworkflows. Adobe Systems made the PDF specification available free of charge in 1. PDF was a proprietary format controlled by Adobe, until it was officially released as an open standard on July 1, 2. International Organization for Standardization as ISO 3. ISO Committee of volunteer industry experts. In 2. 00. 8, Adobe published a Public Patent License to ISO 3. Adobe that are necessary to make, use, sell, and distribute PDF compliant implementations. PDF 1. Adobe, such as Adobe XML Forms Architecture XFA and Java. Script extension for Acrobat, which are referenced by ISO 3. ISO 3. 20. 00 1 specification. These proprietary technologies are not standardized and their specification is published only on Adobes website. Josh Blue Sticky Change Downloads. How To Install Windows 7 On Dos Laptop Stand. Many of them are also not supported by popular third party implementations of PDF. On July 2. 8, 2. 01. ISO 3. 20. 00 2 was published by the ISO. ISO 3. 20. 00 2 does not include any proprietary technologies as normative references. Technical foundationseditThe PDF combines three technologies A subset of the Post. Script page description programming language, for generating the layout and graphics. A font embeddingreplacement system to allow fonts to travel with the documents. A structured storage system to bundle these elements and any associated content into a single file, with data compression where appropriate. Post. ScripteditPost. 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 if and loop commands. PDF is largely based on Post. Script but simplified to remove flow control features like these, while graphics commands such as lineto remain. 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. Any files, graphics, or fonts to which the document refers also are collected. Then, everything is compressed to a single file. Therefore, the entire Post. Script world fonts, layout, measurements remains intact. As a document format, PDF has several advantages over Post. Script PDF contains tokenized and interpreted results of the Post. Script source code, for direct correspondence between changes to items in the PDF page description and changes to the resulting page appearance. PDF from version 1. Post. Script does not. Post. Script is an interpreted programming language with an implicit global state, so instructions accompanying the description of one page can affect the appearance of any following page. Therefore, all preceding pages in a Post. Script document must be processed to determine the correct appearance of a given page, whereas each page in a PDF document is unaffected by the others. As a result, PDF viewers allow the user to quickly jump to the final pages of a long document, whereas a Post. Script viewer needs to process all pages sequentially before being able to display the destination page unless the optional Post. Script Document Structuring Conventions have been carefully complied with. Technical overvieweditFile structureeditA PDF file is a 7 bit ASCII file, except for certain elements that may have binary content. A PDF file starts with a header containing the magic number and the version of the format such as PDF 1. The format is a subset of a COS Carousel Object Structure format. A COS tree file consists primarily of objects, of which there are eight types 1. Boolean values, representing true or false. Numbers. Strings, enclosed within parentheses., may contain 8 bit characters. Names, starting with a forward slash Arrays, ordered collections of objects enclosed within square brackets. Dictionaries, collections of objects indexed by Names enclosed within double pointy brackets lt lt. Streams, usually containing large amounts of data, which can be compressed and binary. The null object. Furthermore, there may be comments, introduced with the percent sign. Comments may contain 8 bit characters. Objects may be either direct embedded in another object or indirect. Indirect objects are numbered with an object number and a generation number and defined between the obj and endobj keywords. An index table, also called the cross reference table and marked with the xref keyword, follows the main body and gives the byte offset of each indirect object from the start of the file. This design allows for efficient random access to the objects in the file, and also allows for small changes to be made without rewriting the entire file incremental update. Beginning with PDF version 1. 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 trailer keyword. It contains. A dictionary. An offset to the start of the cross reference table the table starting with the xref keywordAnd the EOFend of file marker. The dictionary contains. A reference to the root object of the tree structure, also known as the catalog. The count of indirect objects in the cross reference table. And other optional information. There are two layouts to the PDF files non linear not optimized and linear optimized. 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 files may be optimized using Adobe Acrobat software or QPDF. Imaging modeleditThe 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. PDF graphics use a device independent. Cartesian coordinate system to describe the surface of a page. A PDF page description can use a matrix to scale, rotate, or skew graphical elements. A key concept in PDF is that of the graphics state, which is a collection of graphical parameters that may be changed, saved, and restored by a page description. PDF has as of version 1. Vector graphicseditAs in Post. Script, vector graphics in PDF are constructed with paths. Paths are usually composed of lines and cubic Bzier curves, but can also be constructed from the outlines of text. Unlike Post. Script, PDF does not allow a single path to mix text outlines with lines and curves. Paths can be stroked, filled, clipping.