/usr/bin/tiffcmp: invalid option -- '-'
LIBTIFF, Version 4.7.2
Copyright (c) 1988-1996 Sam Leffler
Copyright (c) 1991-1996 Silicon Graphics, Inc.

Compare the tags and data in two TIFF files

usage: tiffcmp [options] file1 file2
where options are:
 -l		list each byte of image data that differs between the files
 -z #		list specified number of bytes that differs between the files
 -t		ignore any differences in directory tags