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Image Compression (GIF/TIFF/PCX)

  • Bill Buchanan

Abstract

Data communication increasingly involves the transmission of still and moving images. Compressing images into a standard form can give great savings in transmission times and storage lengths. Some of these forms are outlined in Table 4.1. The main parameters in a graphics file are:
  • The picture resolution. This is defined by the number of pixels in the x-and y-directions.

  • The number of colors per pixel. If N bits are used for the bit color then the total number of displayable colors will be 2 N . For example an 8-bit color field defines 256 colors, a 24-bit color field gives 224 or 16.7M colors. Many new computer systems allow for 32-bit color which gives over 4 billion colors.

  • Palette size. Some systems reduce the number of bits used to display a color by reducing the number of displayable colors for a given palette size.

Keywords

Image Compression File Header Color Table Compression Code Unsigned Integer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Bill Buchanan
    • 1
  1. 1.Napier UniversityScotland

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