PDF is a file format developed by Adobe Systems for representing documents in a manner that is separate from the original operating system, application or hardware from where it was originally created. A PDF file can be any length, contain any number of fonts and images and is designed to enable the creation and transfer of printer-ready output.
Each PDF file encapsulates a complete description of a 2D document (and, with the advent of Acrobat 3D, embedded 3D documents) that includes the text, fonts, images and 2D vector graphics that compose the document. They do not encode information that is specific to the application software, hardware, or operating system used to create or view the document.
The .pcx file extension was developed in the 1980s by the ZSoft Corporation. It has since been superseded by other image formats such as png, giff and jpeg. The file type is used rarely at present, however certain scanning devices still output to the .pcx format.
The PCX format was one of the first common bitmap image formats. A PCX file comprises of three elements: the header, image data and the 256 colour palette. PCX utiises a lossless compression technique. The compression technique used is not processor intensive which was an advantage at the time of development due to the relatively limited processing power of hardware in the 1980s.
Adobe Photoshop Microsoft Paint Windows Picture and Fax Viewer