compare − mathematically and visually annotate the difference between an image and its reconstruction.
magick compare input-file input-file [options] output-file
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-7/www/compare.html or https://imagemagick.org/script/compare.php.
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
−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
−metric type measure differences between images with
this metric
−monitor monitor progress
−negate replace each pixel with its complementary
color
−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
−read-mask filename associate a read mask with the
image
−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
−write-mask filename associate a write mask with the
image
−verbose print detailed information about the image
−virtual-pixel method
virtual pixel access method
Image Operators:
−auto-orient automatically orient image
−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
−sigmoidal-contrast geometry
lightness rescaling using sigmoidal contrast enhancement
−trim trim image edges
Image Channel
Operators:
−separate separate an image channel into a grayscale
image
Image Sequence
Operators:
−crop geometry cut out a rectangular region of the
image
−write filename write images to this file
Image Stack
Operators:
−delete indexes delete the image from the image
sequence
Miscellaneous
Options:
−channel mask set the image channel mask
−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.
ImageMagick(1)
Copyright (C) 1999 ImageMagick Studio LLC. Additional copyrights and licenses apply to this software, see file:///usr/share/doc/ImageMagick-7/www/license.html or https://imagemagick.org/script/license.php