Legacy ImageMagick Discussions Archive

Hello,

I have rather odd request. Below are two images, there is seemingly a software which produces 3rd image (the difference). I could not understand what method they use. Asking in here with the hope someone may understand it better than me.

Background information: There are car repair shops or maintenance places. They are taking picture of the bottom of a car. Next visit, another picture taken and people would like to see what has changed. How that picture taken is not known to me. Seems like a fish eye lens, or a stitch of several pictures.

Image 1: https://imgur.com/a/qABBRjD
Image 2: https://imgur.com/a/TH9xVoz
Difference of 1 and 2: https://imgur.com/a/LXsQkKx

Any help is appreciated.

Thanks.

Please, always provide your IM version and platform when asking questions, since syntax may differ. Also provide your exact command line and if possible your images.

See the top-most post in this forum "IMPORTANT: Please Read This FIRST Before Posting" at http://www.imagemagick.org/discourse-se ... f=1&t=9620

For novices, see

http://www.imagemagick.org/discourse-se ... f=1&t=9620
http://www.imagemagick.org/script/comma ... essing.php
http://www.imagemagick.org/Usage/reference.html
http://www.imagemagick.org/Usage/
https://github.com/ImageMagick/usage-markdown

If the two images are perfectly aligned with each other, you can use the compare function or -compose difference -composite.

See
http://www.imagemagick.org/script/compare.php
http://www.imagemagick.org/Usage/compare/
http://www.imagemagick.org/Usage/compose/#compose
http://www.imagemagick.org/Usage/compose/#difference


Your images are not well aligned nor the same size. So you will see lots of differences.

Unix syntax:

Input:





Darker Red is more different:

Blue is more different than red: