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SGI is the native file format of the limage image library found on Silicon
Graphics workstations. The limage library provides a set of functions used
to read and write SGI images.

The SGI file format is a creation of Paul Haeberli (paul@sgi.com) at Silicon
Graphics Computer Systems. The SGI format specification may be found at:

  ftp://ftp.sgi.com/graphics/SGIIMAGESPEC
 
The SGI format is also known as the RGB file format. On SGI workstations
you can get info on RGB and the limage library by using the following
command:
 
  % man 4 rgb