I ran the test script on this sunset photo: <https://i.imgur.com/9EXyYlJ.jpg>. Output for the different algorithms:

* otree: https://i.imgur.com/AnqaTLE.png

* mindiff: https://i.imgur.com/2UMzyub.png

* mix: https://i.imgur.com/TJm6tJ3.png

I've updated the README.md. You may get the example at README.md.