Core services used by diffux/diffux.
diffux-core comes with a couple of useful command-line tools.
Take a snapshot of a URL and save as a PNG image.
Take a snapshot of http://www.google.com in a 1200 pixel wide window and save as "google.png":
diffux-snapshot --url http://www.google.com \ --outfile google.png -- \ --width 1200
Take a snapshot of http://www.google.com in a 320 pixel wide window, use a custom user-agent header, and save as "google-mobile.png":
diffux-snapshot --url http://www.google.com \ --outfile google-mobile.png -- \ --width 320 \ --useragent "c3p0 (Netscape compatible)"
You can limit the area that the snapshot image is taken for by providing a
diffux-snapshot --url http://www.yahoo.com \ --outfile yahoo.png -- \ --cropselector ".searchwrapper"
In this example, if no element is found with a
searchwrapper class on the
page, the crop selector will be ignored and the snapshot will contain the
If more than one element matches the crop selector, only the first one will be included in the snapshot image.
Compare two snapshots (or any images for that matter) and outputs a diff if the two images are different.
Compare a previously snapshotted google.com image with a new version:
diffux-compare --before-image google1.png \ --after-image google2.png
If a diff is detected, a
diff.png file is saved in the current folder. This
file is a side-by-side line-up of the before and after image with a diff
representation in the middle. The script will also exit with a non-zero exit
If there is no diff between the before and after image, the program will silently exit with no output. The exit code in this case is zero.
You can override the output file if you want to:
diffux-compare --before-image google1.png \ --after-image google2.png \ --outfile diff.png
Here's an example of a diff.png output from