PDF is used for representing two-dimensional documents that include text, fonts, images and two-dimensional vector graphics. In Acrobat 3-D, the ability of PDF also includes a three-dimensional reading of the document. PDF has become an ISO standard on July 1, 2008 with the code ISO 32000-1:2008.
PDF document interface is generally made up of a combination of text, vector graphics, raster graphics and. Vector graphics are used to display the illustration created by lines and curves, while raster graphics are used to display photos and images.
In the next format improvements, PDF documents are also capable of supporting hyperlinks, forms, javascript, and many other capabilities that can be supported by adding plugins. PDF Document version 1.6 has the ability to display interactive three-dimensional graphics.
PDF files can be created specifically to be accessible by people with disabilities / physical limitations. PDF files can be equipped with a label (tag) XML, text equivalent, visual text magnification (magnifier), the addition of modern audio / voice, and so on.
Some PDF creator software such as Adobe InDesign can automatically create PDF files labeled. PDF files can be encoded so as to be able to open or edit it required a certain keyword.
PDF file Encryption is done in two levels, namely 40-bit and 128-bit by using a complex system of RC4 and MD5 password. PDF files can also be DRM restrictions to limit the activity of copying, editing, and printing the file.
When first introduced in 1993, the use of document PDF format is relatively low. At that time the software to create PDF documents (Adobe Acrobat) and the software to read it (Acrobat Reader, now Adobe Reader) are commercially available, are not distributed free of charge.
The earliest versions do not support all PDF external links, which makes it less integrated with the World Wide Web, and the addition of large sized PDF files transmitted data packets makes it slow to download (download) with the speed of the modem at the time.
Other causes kekurangpopuleran PDF of the time due to the PDF file format must compete on the level of its use with other formats sepertiEnvoy, Common Ground Digital Paper, and PostScript (. Ps). PostScript is also a format created by Adobe and some of its functions are implemented in the PDF.
The rate of increase in the use of PDF documents increased rapidly after the start distributing software Adobe Acrobat Reader for free. They also relieve anyone to create an app maker and reader of PDF documents without the need to pay royalties to Adobe Systems as the holder of the patent PDFs.
PDF document format combines three technologies:
Sub-set of the PostScript page description programming to generate and display graphics system placement / removal letters to permit movement of the letters in the document structured storage systems to place and compress elements of the document into a single file.
PDF documents are generally made up of a combination of text, vector graphics, raster graphics and. Vector graphics are used to display the illustration created by lines and curves, while raster graphics are used to display photos and images.
In the next format improvements, PDF documents are also capable of supporting hyperlinks, forms, javascript, and many other capabilities that can be supported by adding plugins. PDF Document version 1.6 has the ability to display interactive three-dimensional graphics.
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