You are probably using Blink-Diff for the image comparison. Isn't it? https://github.com/yahoo/blink-diff https://github.com/yahoo/blink-diff For example: http

You are probably using Blink-Diff for the image comparison. Isn't it? https://github.com/yahoo/blink-diff https://github.com/yahoo/blink-diff For example: https://raw.githubusercontent.com/yahoo/blink-diff/master/examples/YDN_Sort_output.png https://raw.githubusercontent.com/yahoo/blink-diff/master/ex... You can change the highlight-color to green (it is a configuration option), just like it is on the page there: https://diffio.global.ssl.fastly.net/v1/diffs/2015-05-28/eee2f08b89fa67377fd18ccb990c7d45f1464f95/montage.png https://diffio.global.ssl.fastly.net/v1/diffs/2015-05-28/eee... And the "montage" is called a "composition" in Blink-Diff.