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PDF and PostScript: How Are They Connected?

Published On January 30, 2019 | By admin | Health, Supplement

PDF is a format that uses the capabilities of the PostScript language developed by Adobe Systems. This format is intended so that printing products can be presented in electronic form. It is also used to create presentations, e-books and documents. By the way, you can convert pdf to doc easily whenever you need to make some corrections.

What Is PostScript Programming Language?

PostScript programming language was designed to send commands to printers. The process of printing with it is automated and simplified. The printer-friendly PostScript code pixels are converted by page layout. The document on the screen is displayed as an image after being saved as PDF. Pixels during the conversion of the document are replaced by halftone dots, set in a certain sequence. When printing, they are reproduced. The shape of the points used is round. Their size is a few pixels. They do not cover the whole image and do not have a special color, which distinguishes them from pixels. The size of the dots is different, which creates the impression when viewing that several shades are used. True second and third level PostScript code is created by vector graphics programs. This particular code is sent to the printer.

The PostScript programming language has a set of control constructs. Compilation of the program in this language does not occur. It is interpreted. For data used by operators, storage grids are used. In essence, a program written in PostScript is a sequence of operators that are specified in reverse Polish notation or postfix notation — operands are before the operators in it. Operands are written to the stack by the interpreter when reading the program file. From the stack after these operands are removed and executed by the operator. This is a cross-platform language, that is, the document can be seen later in exact accordance with the original, regardless of which platform was used to create it. In addition, it is machine-independent. In practice, this means that both printers and printing machines can be used for printing. Algorithms for data compression in PDF are supported a lot, they are compact documents. Also, it's worth noting the multimedia format. It can be used to preview pages, hypertext elements, images, sounds and much more.

The Benefits of PDF

Pros of the PDF format are the following:

  • Standardization and popularity: it opens on any devices with any operating systems exactly in the form in which it was created;
  • PDF format viewer, Adobe Acrobat Reader, is often preinstalled on the computer if the device was shipped with the operating system. If not, it is available for download from the Adobe Systems developer site and it is completely free;
  • Takes up little space on the hard disk, because it supports many compression algorithms;
  • Security: the user can configure security settings for his PDF file, for example, prohibiting printing, prohibiting editing, using electronic signatures to determine the authenticity of the document, etc.

Now you know more about PDF format and can enjoy all the benefits it has.

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