After I was a toddler, I liked in search of Waldo within the “The place’s Waldo?” guide collection. As of late I am a sucker for TMZ’s “What is the Massive Frigin Distinction” photographs, the place TMZ barely modifications a picture and you must spot the variations between the 2. That received me to considering — how simply may I automate diff’ing two photographs? This StackOverflow submit was gold.

To create a diff of two related photographs, we’ll use ImageMagick’s convert command line utility with a big host of configurations:

convert '(' image1.png -flatten -grayscale Rec709Luminance ')' 
        '(' image2.png -flatten -grayscale Rec709Luminance ')' 
        '(' -clone 0-1 -compose darken -composite ')' 
        -channel RGB -combine diff.png

How efficient is that this command with its configuration arguments? Let’s take a look:

Authentic Picture

Modified Picture

Diff’ed Picture

The diff picture result’s fairly informative! The dimensions of the sun shades is clearly introduced, and should you look carefully, you possibly can see one cranium on the top-right of the shirt has been flipped.

No matter your cause for eager to establish the distinction two photographs, ImageMagick’s convert software is spectacular. You possibly can do 1,000,000 issues with ImageMagick; try my Media tutorials to study extra superior methods to change photographs, movies, and audio!