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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)
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