jpeghotp(1) [debian man page]

JPEGHOTP(1)							   User Commands						       JPEGHOTP(1)

NAME

       jpeghotp - find hot or dead pixels in otherwise black or white JPEG images

SYNOPSIS

       jpeghotp [OPTION]... JPEG-FILE [PIXEL-BLOCKS-FILE]

DESCRIPTION

       Jpeghotp  automatically finds hot pixels in an otherwise black JPEG image (default) or dead pixels in an otherwise white JPEG image (if the
       --invert option is specified). The output is suitable as a pixel block specification file for the jpegpixi(1) program. A  typical  applica-
       tion is to process an image taken with a digital camera with CCD defects.

       To  obtain  a black image, take a picture in total darkness or with covered lens. To obtain a while image, take an overexposed picture of a
       well-lit piece of white paper.

       JPEG-FILE is the filename of the JPEG image to read. It can be -, which refers to standard input.

       PIXEL-BLOCKS-FILE is the name of the file to write the coordinates and sizes of the hot (or dead) pixel blocks to. If it  is  omitted,  the
       coordinates and sizes are written to standard output.

OPTIONS

       -t THRESHOLD, --threshold=THRESHOLD
	      Specify  the threshold between noise and signal. Pixel luminosities below the threshold are considered CCD noise, luminosities above
	      are considered hot pixels.  THRESHOLD must be a number between 0 and 100 followed by a percent character (%).  The default is 10%.

       -i, --invert
	      Invert the image. If this option is specified, dead pixels in an otherwise white image instead of hot pixels in an  otherwise  black
	      image are found.

       -c, --comments
	      Output comments with the luminosities of the hot (or dead) pixel blocks.	This can be helpful in hand tuning the pixel blocks file.

       --help Display a short help text and exit immediately.

       --version
	      Display version information and exit immediately.

BUGS

       Please report bugs to <martin-jpegpixi@zero-based.org>.

COPYRIGHT

       Copyright (C) 2003, 2004, 2005 Martin Dickopp

       Jpeghotp is free software; it may be copied and/or modified under the terms of the GNU General Public License version 2 or (at your option)
       any later version. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SEE ALSO

       jpegpixi(1)

       The jpegpixi homepage: http://www.zero-based.org/software/jpegpixi/

jpegpixi 1.1.1							    18-Apr-2005 						       JPEGHOTP(1)

Check Out this Related Man Page

pbmclean(1)						      General Commands Manual						       pbmclean(1)

NAME

       pbmclean - flip isolated pixels in portable bitmap

SYNOPSIS

       pbmclean [-minneighbors=N] [-black|-white] [pbmfile]

       You  can use the minimum unique abbreviation of the options.  You can use two hyphens instead of one.  You can separate an option name from
       its value with white space instead of an equals sign.

       Before December 2001, pbmclean accepted -N instead of -minneighbors.

DESCRIPTION

       pbmclean cleans up a PBM image of random specs.	It reads a PBM image as input and outputs a PBM that is the same as the input except  with
       every pixel which has less than N identical neighbours inverted.

       The default for N is 1 - only completely isolated pixels are flipped.

       (A  value  of  N greater than 8 generates a completely inverted image (but use pnminvert to do that) -- or a completely white or completely
       black image with the -black or -white option).

       pbmclean considers the area beyond the edges of the image to be white.  (This matters when you consider pixels right on	the  edge  of  the
       image).

       You can use pbmclean to clean up "snow" on bitmap images.

OPTIONS

       -black

       -white Flip  pixels of the specified color.  By default, if you specify neither -black nor -white, pbmclean flips both black and white pix-
	      els which do not have sufficient identical neighbors.  If you specify -black, pbmclean leaves the white pixels alone and just erases
	      isolated black pixels.  Vice versa for -white.  You may specify both -black and -white to get the same as the default behavior.

SEE ALSO

       pbm(5)

AUTHOR

       Copyright (C) 1990 by Angus Duggan Copyright (C) 1989 by Jef Poskanzer.	Copyright (C) 2001 by Michael Sternberg.

       Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro-
       vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice  appear  in  sup-
       porting documentation.  This software is provided "as is" without express or implied warranty.

								    18 Oct 2001 						       pbmclean(1)

Linux and UNIX Man Pages

jpeghotp(1) [debian man page]

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