NAME

       compface, uncompface - compress and expand 48x48x1 face image files

SYNOPSIS

       compface [ infile [ outfile ] ] ...

       uncompface [-X] [ infile [ outfile ] ] ...

DESCRIPTION

       compface  is  a  filter  for  generating highly compressed representations of 48x48x1 face
       image files.  uncompface is an inverse filter which  performs  an  inverse  transformation
       with  no  loss  of  data.  The algorithm used is highly tuned for its purpose and achieves
       better than a five to one compression ratio on average.  Arguments operate identically for
       both  programmes.  The first argument, if present, causes input to be taken from the named
       file instead of from standard input unless it is the string ``-''.  A second argument,  if
       present,  causes output to go to the named file instead of to standard output unless it is
       the string ``-''.  Subsequent pairs of arguments may be used to specify further  pairs  of
       input and output files.

       The input format for compface (and the output format for uncompface) is 48 lines each of 3
       sixteen bit hexadecimal integers, comma terminated in C  initialiser  style.   The  output
       format  of  compface (and the input format for uncompface) is some number of lines made up
       of a space followed by printable characters (in the range ``!'' to ``~'' inclusive).   The
       first  line  contains  72 characters and following lines contain 79 characters except that
       the last line may be short.

       This version of compface has been patched to also be able to  handle  normal  XBM  images.
       uncompface will produce XBM output only if the -X switch is applied.

       The  amount  of  compression  obtained  varies  between face image files but the output of
       compface averages less than 200 characters.  The average number of output lines is three.

DIAGNOSTICS

       Exit status is normally 0.  Possible errors include IO errors  when  opening,  reading  or
       writing  files, format errors in compface input files and invalid arguments.  Each results
       in an explanatory message on standard error and an exit status of 1.  A  warning  will  be
       produced if compface detects extra input data.

BUGS

       Nominating standard input as input more than once does not work.

SEE ALSO

       Compface(3)

                                         25 January 1990                              COMPFACE(1)