Enhancement Suggestion: View Image in overlapped groups

I was watching how the Frostbite team handled their screenshot test management on YouTube and a really cool 4-way image comparison was a part of the process.

It was an approach that used the mouse over the image to create the split between before, after, diff, and a diff of pixels outside a tolerance.

I'm not really sure how tkinter handles the images though, it would be cool to investigate this.

Here is a screencapture from the web tool:

Here is a screenshot from their upgraded and faster tool with even more features, at this timestep: