NAME

       ocrad - command line text recognition tool

SYNOPSIS

       ocrad [options] [files]

DESCRIPTION

       GNU  Ocrad is an OCR (Optical Character Recognition) program based on a feature extraction
       method. It reads images in png or pnm formats and produces text in byte (8-bit)  or  UTF-8
       formats. The formats pbm (bitmap), pgm (greyscale), and ppm (color) are collectively known
       as pnm.

       Ocrad includes a layout analyser able to separate the columns or blocks of  text  normally
       found on printed pages.

       For  best  results  the characters should be at least 20 pixels high. If they are smaller,
       try the option --scale. Scanning the image at 300 dpi usually produces  a  character  size
       good  enough for ocrad.  Merged, very bold, or very light (broken) characters are normally
       not recognized correctly. Try to avoid them.

OPTIONS

       -h, --help
              display this help and exit

       -V, --version
              output version information and exit

       -a, --append
              append text to output file

       -c, --charset=<name>
              try '--charset=help' for a list of names

       -e, --filter=<name>
              try '--filter=help' for a list of names

       -E, --user-filter=<file>
              user-defined filter, see manual for format

       -f, --force
              force overwrite of output file

       -F, --format=<fmt>
              output format (byte, utf8)

       -i, --invert
              invert image levels (white on black)

       -l, --layout
              perform layout analysis

       -o, --output=<file>
              place the output into <file>

       -q, --quiet
              suppress all messages

       -s, --scale=[-]<n>
              scale input image by [1/]<n>

       -t, --transform=<name>
              try '--transform=help' for a list of names

       -T, --threshold=<n>
              threshold for binarization (0.0-1.0)

       -u, --cut=<l,t,w,h>
              cut the input image by the rectangle given

       -v, --verbose
              be verbose

       -x, --export=<file>
              export results in ORF format to <file>

       If no files are specified, or if a file is '-', ocrad reads the image from standard input.
       If the option -o is not specified, ocrad sends text to standard output.

       Exit  status:  0  for a normal exit, 1 for environmental problems (file not found, invalid
       flags, I/O errors, etc), 2 to indicate a corrupt or invalid input file, 3 for an  internal
       consistency error (e.g., bug) which caused ocrad to panic.

REPORTING BUGS

       Report bugs to bug-ocrad@gnu.org
       Ocrad home page: http://www.gnu.org/software/ocrad/ocrad.html
       General help using GNU software: http://www.gnu.org/gethelp

COPYRIGHT

       Copyright  ©  2022  Antonio  Diaz  Diaz.   License  GPLv2+:  GNU  GPL  version  2 or later
       <http://gnu.org/licenses/gpl.html>
       This is free software: you are free to change and redistribute it.  There is NO  WARRANTY,
       to the extent permitted by law.

SEE ALSO

       The full documentation for ocrad is maintained as a Texinfo manual.  If the info and ocrad
       programs are properly installed at your site, the command

              info ocrad

       should give you access to the complete manual.