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compare(1)                  General Commands Manual                 compare(1)
NAME
       compare  -  mathematically and visually annotate the difference between
       an image and its reconstruction.
SYNOPSIS
       compare input-file input-file [options] output-file
OVERVIEW
       The compare program is a member of the ImageMagick(1) suite  of  tools.
       Use  it  to mathematically and visually annotate the difference between
       an image and its reconstruction.
       For more information about the compare command, point your  browser  to
       file:///usr/share/doc/ImageMagick-6/www/compare.html@EXTRA_DOC_DIR@  or
       https://imagemagick.org/script/compare.php.
DESCRIPTION
       Image Settings:
         -alpha option        on, activate, off, deactivate, set, opaque, copy
                               transparent, extract, background, or shape
         -authenticate value  decrypt image with this password
         -background color    background color
         -channel type        apply option to select image channels
         -colorspace type     alternate image colorspace
         -compose operator    set image composite operator
         -compress type       type of pixel compression when writing the image
         -decipher filename   convert cipher pixels to plain pixels
         -define format:option
                              define one or more image format options
         -density geometry    horizontal and vertical density of the image
         -depth value         image depth
         -dissimilarity-threshold value
                               maximum distortion for (sub)image match
         -encipher filename   convert plain pixels to cipher pixels
         -extract geometry    extract area from image
         -format "string"     output formatted image characteristics
         -fuzz distance       colors within this distance are considered equal
         -gravity type        horizontal and vertical text placement
         -identify            identify the format and characteristics  of  the
       image
         -interlace type      type of image interlacing scheme
         -highlight-color color
                              emphasize pixel differences with this color
         -limit type value    pixel cache resource limit
         -lowlight-color color
                              de-emphasize pixel differences with this color
         -mask filename       associate a mask with the image
         -metric  type          measure  differences  between images with this
       metric
         -monitor             monitor progress
         -passphrase filename get the passphrase from this file
         -profile filename    add, delete, or apply an image profile
         -quality value       JPEG/MIFF/PNG compression level
         -quiet               suppress all warning messages
         -quantize colorspace reduce colors in this colorspace
         -regard-warnings     pay attention to warning messages
         -repage geometry     size and location of an image canvas
         -respect-parentheses settings  remain  in  effect  until  parenthesis
       boundary
         -sampling-factor geometry
                              horizontal and vertical sampling factor
         -seed value          seed a new sequence of pseudo-random numbers
         -set attribute value set an image attribute
         -similarity-threshold value
                               minimum distortion for (sub)image match
         -size geometry       width and height of image
         -subimage-search     search for subimage
         -synchronize         synchronize image to storage device
         -taint               declare the image as modified
         -transparent-color color
                              transparent color
         -type type           image type
         -verbose             print detailed information about the image
         -virtual-pixel method
                              virtual pixel access method
       Image Operators:
         -brightness-contrast geometry
                              improve brightness / contrast of the image
         -distort method args
                               distort  images  according  to given method and
       args
         -level value         adjust the level of image contrast
         -resize geometry     resize the image
         -rotate degrees      apply Paeth rotation to the image
         -separate            separate an image channel into a grayscale image
         -trim                trim image edges
         -write filename      write images to this file
       Image Sequence Operators:
         -crop geometry       cut out a rectangular region of the image
       Image Stack Operators:
         -delete indexes      delete the image from the image sequence
       Miscellaneous Options:
         -debug events        display copious debugging information
         -help                print program options
         -log format          format of debugging information
         -list type           print a list of supported option arguments
         -version             print version information
       By default, the image format of `file' is determined by its magic  num-
       ber.   To  specify a particular image format, precede the filename with
       an image format name and a colon (i.e. ps:image) or specify  the  image
       type as the filename suffix (i.e. image.ps).  Specify 'file' as '-' for
       standard input or output.
       Two images are considered similar if their difference according to  the
       specified metric and fuzz value is 0, with the exception of the normal-
       ized cross correlation metric (NCC), where two  images  are  considered
       similar  when their normalized cross correlation is 1. The default met-
       ric is NCC.
       The compare program returns 2 on error, 0 if the images are similar, or
       a value between 0 and 1 if they are not similar.
SEE ALSO
       ImageMagick(1)
COPYRIGHT
       Copyright  (C)  1999  ImageMagick Studio LLC. Additional copyrights and
       licenses apply to this  software,  see  file:///usr/share/doc/ImageMag-
       ick-6/www/license.html@EXTRA_DOC_DIR@        or       https://imagemag-
       ick.org/script/license.php
ImageMagick                Date: 2009/01/10 01:00:00                compare(1)