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.
If the -X option is given to uncompface, it generates XBM format
directly.
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)