Comparing Images using Image Magick
Here is a great tool to compare the images. You can easily compare to images, the output of this comparison tool can be a image to be saved or can be a temporary display based on your options. This tool will annotate the diff visually. Image Magick has lot of command line tools to for manipulating the images such as convert, compare, animate and so on. Here we are going to know about it’s “compare”.
Image Magick can be installed on Linux, Windows or Mac. The following command same on any OS. The only difference is to go the respective software path.
Download Image Magick at Download
Unzip the downloaded zip file and go it’s root folder. Follow the installation procedure reside in it’s respective .txt files.
Usage:
Syntax: compare [Options] image1 image2 difference_image
Ex1: compare Scatter.png Line.png difference.png
in the above example Scatter.png is the image to be compared with Line.png and the Difference.png will the be out put image of the comparison. The red color in the difference image indicates the difference part of the two images.
If you like to view the image directly instead of saving it to an another image you can use the below command
compare Scatter.png Line.png x:
You can even the change difference color from red to some other color using the following command
compare Scatter.png Line.png -highlight-color blue difference.png
You can use a special command to know the actual number pixels differed in the two images. The result will be zero for the same image.
compare -metric AE Scatter.png Line.png difference.png
to know more about this command browse
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