HPGL File Format
   
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    GraphicsAcademy.com  >  File Formats  >  Hewlett-Packard Graphics Language

       

     

    HPGL File Format

    Short Name HPGL
    Long Name Hewlett-Packard Graphics Language
    Typical File Extensions .plt .hpg .hp2 .pl2
    Contains Vector
    HPGL (sometimes written HP-GL or HP/GL) is a relatively simple vector based page description language, originally developed by Hewlett-Packard for controlling pen plotters, but later also incorporated into standard printers (including laser printers and inkjets).

    The initial version of the format, known simply as "HP/GL", consisted of a series of commands encoded as plain human-readable (albeit cryptic) ASCII text. The commands gave setup information for the plotter and drawing instructions, telling the plotter to draw lines, arcs or text, etc., at various positions on the page. Maximum resolution was limited to 1/40th of a millimeter (1016 DPI). One oddity is that there were however no commands for setting line widths, since these were determined by the particular pens loaded into the plotter.

    Hewlett-Packard did eventually revise the language in a backward compatible way ("HP/GL2&"), but adding several additional new features including:
    • A choice of encoding the command stream as ASCII text (for readability) or as binary data (to save space and reduce transfer times).

    • Support for higher resolutions.

    • Ability to select pen widths.

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      Graphics File Formats
       
        
      By David C. Kay

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      Paperback (496 pages)

      Product Description:
      This text features detailed specifications for 30 popular graphics file formats so that readers can more quickly and easily decide which standards are best for their applications. New to this edition are chapters on formats important to multimedia and video, including MPEG, FL1 and QuickTime; expanded discussion of data compression; and coverage of format updates, such as TIFF 6.0. Readers can also get updated information on: JPEG; GEM bit image; Windows BMP; PostScript; HP PCL; CGM; GIF; Targa; MacPaint; PICT; Windows Metafile; and Lotus PIC. This book should be of interest to software developers, systems managers and computer hobbyists.

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