{ "mode": "man", "parameter": "compare-im6", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/compare-im6/1/json", "generated": "2026-06-16T06:21:09Z", "synopsis": "compare-im6.q16 input-file input-file [options] output-file", "sections": { "NAME": { "content": "compare - mathematically and visually annotate the difference between an image and its recon‐\nstruction.\n", "subsections": [] }, "SYNOPSIS": { "content": "compare-im6.q16 input-file input-file [options] output-file\n", "subsections": [] }, "OVERVIEW": { "content": "The compare-im6.q16 program is a member of the ImageMagick-ims6.q16(1) suite of tools. Use\nit to mathematically and visually annotate the difference between an image and its recon‐\nstruction.\n\nFor more information about the compare command, point your browser to\nfile:///usr/share/doc/imagemagick-6-common/html/www/compare.html (on debian system you may\ninstall the imagemagick-6 package) or http://imagemagick.org/script/compare.php.\n", "subsections": [] }, "DESCRIPTION": { "content": "Image Settings:\n-alpha option on, activate, off, deactivate, set, opaque, copy\ntransparent, extract, background, or shape\n-authenticate value decrypt image with this password\n-background color background color\n-channel type apply option to select image channels\n-colorspace type alternate image colorspace\n-compose operator set image composite operator\n-compress type type of pixel compression when writing the image\n-decipher filename convert cipher pixels to plain pixels\n-define format:option\ndefine one or more image format options\n-density geometry horizontal and vertical density of the image\n-depth value image depth\n-dissimilarity-threshold value\nmaximum distortion for (sub)image match\n-encipher filename convert plain pixels to cipher pixels\n-extract geometry extract area from image\n-format \"string\" output formatted image characteristics\n-fuzz distance colors within this distance are considered equal\n-gravity type horizontal and vertical text placement\n-identify identify the format and characteristics of the image\n-interlace type type of image interlacing scheme\n-highlight-color color\nemphasize pixel differences with this color\n-limit type value pixel cache resource limit\n-lowlight-color color\nde-emphasize pixel differences with this color\n-mask filename associate a mask with the image\n-metric type measure differences between images with this metric\n-monitor monitor progress\n-passphrase filename get the passphrase from this file\n-profile filename add, delete, or apply an image profile\n-quality value JPEG/MIFF/PNG compression level\n-quiet suppress all warning messages\n-quantize colorspace reduce colors in this colorspace\n-regard-warnings pay attention to warning messages\n-repage geometry size and location of an image canvas\n-respect-parentheses settings remain in effect until parenthesis boundary\n-sampling-factor geometry\nhorizontal and vertical sampling factor\n-seed value seed a new sequence of pseudo-random numbers\n-set attribute value set an image attribute\n-similarity-threshold value\nminimum distortion for (sub)image match\n-size geometry width and height of image\n-subimage-search search for subimage\n-synchronize synchronize image to storage device\n-taint declare the image as modified\n-transparent-color color\ntransparent color\n-type type image type\n-verbose print detailed information about the image\n-virtual-pixel method\nvirtual pixel access method\n\nImage Operators:\n-brightness-contrast geometry\nimprove brightness / contrast of the image\n-distort method args\ndistort images according to given method and args\n-level value adjust the level of image contrast\n-resize geometry resize the image\n-rotate degrees apply Paeth rotation to the image\n-separate separate an image channel into a grayscale image\n-trim trim image edges\n-write filename write images to this file\n\nImage Sequence Operators:\n-crop geometry cut out a rectangular region of the image\n\nImage Stack Operators:\n-delete indexes delete the image from the image sequence\n\nMiscellaneous Options:\n-debug events display copious debugging information\n-help print program options\n-log format format of debugging information\n-list type print a list of supported option arguments\n-version print version information\n\nBy default, the image format of `file' is determined by its magic number. To specify a par‐\nticular image format, precede the filename with an image format name and a colon (i.e. ps:im‐\nage) or specify the image type as the filename suffix (i.e. image.ps). Specify 'file' as '-'\nfor standard input or output.\n\nTwo images are considered similar if their difference according to the specified metric and\nfuzz value is 0, with the exception of the normalized cross correlation metric (NCC), where\ntwo images are considered similar when their normalized cross correlation is 1. The default\nmetric is NCC.\n\nThe compare program returns 2 on error, 0 if the images are similar, or a value between 0 and\n1 if they are not similar.\n", "subsections": [] }, "SEE ALSO": { "content": "ImageMagick-im6.q16(1)\n\n", "subsections": [] }, "COPYRIGHT": { "content": "", "subsections": [ { "name": "Copyright (C) 1999-2020 ImageMagick Studio LLC. Additional copyrights and licenses apply to", "content": "this software, see file:///usr/share/doc/imagemagick-6-common/html/www/license.html (on de‐‐\nbian system you may install the imagemagick-6 package) or http://imagemagick.org/script/li‐‐" }, { "name": "cense.php", "content": "ImageMagick Date: 2009/01/10 01:00:00 compare-im6.q16(1)" } ] } }, "summary": "compare - mathematically and visually annotate the difference between an image and its recon‐ struction.", "flags": [], "examples": [], "see_also": [ { "name": "ImageMagick-im6.q16", "section": "1", "url": "https://www.chedong.com/phpMan.php/man/ImageMagick-im6.q16/1/json" } ] }