Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
compare(1)		    General Commands Manual		    compare(1)

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

       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/local/share/doc/ImageMagick-7/www/compare.html	    or

       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
	 -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
	 -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
	 -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:
	 -brightness-contrast geometry
			       improve brightness / contrast of	the image
	 -distort method args
			       distort	images	according  to given method and
	 -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 en-
	 -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 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.  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.


       Copyright (C) 1999-2020 ImageMagick Studio LLC.	Additional  copyrights
       and    licenses	 apply	 to   this   software,	 see   file:///usr/lo-
       cal/share/doc/ImageMagick-7/www/license.html	 or	 http://image-

ImageMagick		   Date: 2009/01/10 01:00:00		    compare(1)


Want to link to this manual page? Use this URL:

home | help