1COMPFACE(1) General Commands Manual COMPFACE(1)
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6 compface, uncompface - compress and expand 48x48x1 face image files
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9 compface [ infile [ outfile ] ] ...
10 uncompface [-X] [ infile [ outfile ] ] ...
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14 compface is a filter for generating highly compressed representations
15 of 48x48x1 face image files. uncompface is an inverse filter which
16 performs an inverse transformation with no loss of data. The algorithm
17 used is highly tuned for its purpose and achieves better than a five to
18 one compression ratio on average. Arguments operate identically for
19 both programmes. The first argument, if present, causes input to be
20 taken from the named file instead of from standard input unless it is
21 the string ``-''. A second argument, if present, causes output to go
22 to the named file instead of to standard output unless it is the string
23 ``-''. Subsequent pairs of arguments may be used to specify further
24 pairs of input and output files.
25 The input format for compface (and the output format for uncompface) is
27 48 lines each of 3 sixteen bit hexadecimal integers, comma terminated
28 in C initialiser style. The output format of compface (and the input
29 format for uncompface) is some number of lines made up of a space fol‐
30 lowed by printable characters (in the range ``!'' to ``~'' inclusive).
31 The first line contains 72 characters and following lines contain 79
32 characters except that the last line may be short.
33 This version of compface has been patched to also be able to handle
35 normal XBM images. uncompface will produce XBM output only if the -X
36 switch is applied.
37 The amount of compression obtained varies between face image files but
39 the output of compface averages less than 200 characters. The average
40 number of output lines is three.
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43 Exit status is normally 0. Possible errors include IO errors when
44 opening, reading or writing files, format errors in compface input
45 files and invalid arguments. Each results in an explanatory message on
46 standard error and an exit status of 1. A warning will be produced if
47 compface detects extra input data.
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50 Nominating standard input as input more than once does not work.
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53 Compface(3)
54 25 January 1990 COMPFACE(1)