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.
Subsequent pairs of arguments may be used to specify further pairs of input and output files. The first line contains 72 characters and fol- lowing lines contain 79 characters except that the last line may be short. 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. Possible errors include IO errors when opening, reading or writing files, format errors in compface input files and invalid arguments.