Optical Character Recognition --- gocr 0.3.5
 using: gocr [options] pnm_file_name  # use - for stdin
 options:
 -h        - get this help
 -i name   - input image file (pnm,pgm,pbm,ppm,pcx,...)
 -i -      - read PNM from stdin (djpeg -gray a.jpg | gocr -)
 -o name   - output file  (redirection of stdout)
 -e name   - logging file (redirection of stderr)
 -p name   - database path (including final slash, default is ./db/)
 -f fmt    - output format (ISO8859_1 TeX HTML UTF8)
 -l num    - grey level 0<160<=255
 -d num    - dust_size (remove all smaller clusters, 10=default)
 -s num    - spacewidth/dots (0 = autodetect)
 -v num    - verbose  [summed]
      1      print more info
      2      list shapes  of boxes (see -c)
      4      list pattern of boxes (see -c)
      8      print pattern after recognition
     16      print line infos
     32      debug outXX.pgm
 -c string - list of chars (_ = not recognized chars)
 -m num    - operation modes, ~ = switch off
      2      use database (early development)
      4      layout analysis, zoning (development)
      8      ~ compare non recognized chars
     16      ~ divide overlapping chars
     32      ~ context correction
     64      char packing (development)
    130      extend database, prompts user (128+2, early development)
 -n   1      only numbers
 examples:
	gocr -v 33 text1.pbm                # some infos + out30.bmp
	gocr -v 7 -c _YV text1.pbm          # list unknown, Y and V chars
	djpeg -pnm -gray text.jpg | gocr -  # use jpeg-file via pipe