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


       compface [ infile [ outfile ] ] ...

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


       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.


       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.


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



                                25 January 1990