NAME

       compare - mathematically and visually annotate the difference between an image and its reconstruction.

SYNOPSIS

       compare-im6.q16 input-file input-file [options] output-file

OVERVIEW

       The  compare-im6.q16  program  is  a  member  of  the  ImageMagick-ims6.q16(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-common/html/www/compare.html  (on  debian  system you may install the
       imagemagick-6 package) 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 number.  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 normalized cross correlation metric (NCC), where two images  are  considered
       similar when their normalized cross correlation is 1. The default metric 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-im6.q16(1)

COPYRIGHT

       Copyright (C) 1999 ImageMagick Studio LLC. Additional copyrights and licenses apply to this software, see
       file:///usr/share/doc/imagemagick-6-common/html/www/license.html (on debian system you  may  install  the
       imagemagick-6 package) or https://imagemagick.org/script/license.php

ImageMagick                                 Date: 2009/01/10 01:00:00                         compare-im6.q16(1)