PostScript is a page description language (PDL) originally developed by Adobe Systems. It is widely used in the electronic and desktop publishing fields to define the layout and graphical content of printed pages. Application programs can generate PostScript code, which can be sent to compatible output devices like laser printers. This code instructs the printer on exactly how to render text and graphics.
Key Features of PostScript§
- Device Independence: PostScript code is independent of the specific characteristics of the output device, making it versatile across different printers and display devices.
- Scalability: Because it describes objects in terms of mathematical expressions, PostScript can scale images and text up or down without loss of quality.
- Extensibility: Users can create custom procedures and incorporate them into the PostScript code, adding extraordinary flexibility.
Examples§
- Print Command for Text:
1% Print "Hello, World!" at position (100, 500)
2100 500 moveto
3/Times-Roman findfont 12 scalefont setfont
4(Hello, World!) show
5showpage
postscript- Drawing a Simple Line:
1% Draw a line from (100, 100) to (200, 200)
2newpath
3100 100 moveto
4200 200 lineto
5stroke
6showpage
postscriptFrequently Asked Questions§
What is PostScript primarily used for?§
PostScript is primarily used for printing documents, graphics, and images from reasonably sophisticated application software onto compatible printers. It is also used extensively in desktop publishing and graphic design.
Do modern printers still use PostScript?§
Yes, many modern high-end and professional printers still support PostScript, as it ensures accurate reproduction of complex documents and graphics which are essential in professional printing environments.
Can PostScript files be converted to other formats like PDF?§
Yes, PostScript files can be converted to other formats such as PDF using tools like Adobe Acrobat or Ghostscript. PDF itself was developed as a simplified, portable form of PostScript.
Is PostScript easy to learn and use?§
PostScript is a powerful yet complex language, and learning it can be challenging. However, basic operations like drawing shapes and printing text are relatively straightforward for those with some programming experience.
Related Terms§
- PDF (Portable Document Format): A file format developed by Adobe that encapsulates a complete description of a fixed-layout flat document, similar to PostScript.
- Raster Image Processor (RIP): A component that converts page description languages like PostScript into a bitmap that can be output on a digital printer.
- Vector Graphics: A method of representing images using geometric and mathematical expressions, which is heavily used in formats like PostScript.
Online References§
Suggested Books for Further Studies§
- “PostScript Language: Tutorial and Cookbook” by Adobe Systems Incorporated.
- “PostScript Language Reference” by Adobe Systems Incorporated.
- “PostScript & Acrobat/PDF: Breakfasts of Champions” by Barry Campbell and Kevin Campbell.
Fundamentals of PostScript: Computing and Desktop Publishing Basics Quiz§
Thank you for exploring the fundamentals of PostScript and challenging yourself with sample exam questions. Keep pushing your understanding of computing and desktop publishing!
