selthresh(1)
NAME
selthresh.h - Simple perl script to choose the "best" threshold when
converting PGM to PBM.
SYNOPSIS
selthresh.h [-yres][-wpath][-lllrl]file1.pgm[file2.pgm...]
DESCRIPTION
This manual page documents briefly the selthresh command. This manual
page was written for the Debian distribution because the original program does not have a manual page.
OPTIONS
These programs follow the usual GNU command line syntax, with long
options starting with two dashes (`-'). A summary of options is
included below. For a complete description, see the Info files.
-y res Sets the resolution (defauts to 600 dpi)
-v Sets the path of the work directory (defaults to "./")
- -l ll rl
- Sets the interval to analyse (defaults to [0.4,0.6])
BUGS
- 1. won't distinguish two files with identical names but on
- different directories. Example:
selthresh /home/foo/foo.pgm /tmp/foo.pgm
WARNINGS
- 1. selthresh destroys the file selthresh.tem.pbm on the work
- directory (if one such file exists), without asking confirmation!
- 2. Make sure that clara, pnmenlarge and pgmtopbm are on the
current path. - 3. Write permission on the work directory is required. Two files
will be created there (selthresh.out and selthresh.temp.pbm). The
file selthresh.out contains all results, please do not remove
it. - 4. The paths of file1.pgm, file2.pgm, etc, must be relative to
the work directory. - 5. The results are affected by MD (see the -P flag), more than
should be. So the threshold quality measured by selthresh is
somewhat "unstable". - 6. Floating comparisons '<=' and '>=' include a 0.001 delta to
avoid failures due to the inexact binary representation of some - tresholds.
SEE ALSO
clara(1),
The programs are documented fully by The Rise and Fall of a Fooish Bar,
available via the Info system.
AUTHOR
- This manual page was written by Eduardo Marcel Macan
<macan@debian.org>, for the Debian GNU/Linux system (but may be used by
others).