MAN page from Old RedHat 5.X faces-1.6.1-10.i386.rpm

COMPFACE

Section: User Commands (1)
Updated: 25 January 1990
Index

NAME

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

SYNOPSIS

compface[infile[outfile]] ...

uncompface[infile[outfile]] ...

DESCRIPTION

compfaceis a filter for generating highly compressed representations of 48x48x1face image files.uncompfaceis an inverse filter which performs an inverse transformation with noloss of data.The algorithm used is highly tuned for its purpose and achieves betterthan 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 namedfile instead of from standard input unless it is the string ``-''.A second argument, if present, causes output to go to the named fileinstead of to standard output unless it is the string ``-''.Subsequent pairs of arguments may be used to specify further pairsof input and output files.

The input format forcompface(and the output format foruncompface)is 48 lines each of 3 sixteen bit hexadecimal integers, comma terminated in Cinitialiser style.The output format ofcompface(and the input format foruncompface)is some number of lines made up of a space followed by printablecharacters (in the range ``!'' to ``~'' inclusive).The first line contains 72 characters and following lines contain79 characters except that the last line may be short.

The amount of compression obtained varies between face image files butthe output ofcompfaceaverages 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 writingfiles, format errors incompfaceinput files and invalid arguments.Each results in an explanatory message on standard error and an exit statusof 1.A warning will be produced ifcompfacedetects extra input data.

BUGS

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

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