Open the image in the Gimp. Duplicate layer adjust opacity then drag it sideways until they line up. Toggle layer visibility.....
Wait, why isn't there a service for this? Or is there?
Wait, why isn't there a service for this? Or is there?
On a stereo image sliding the top image is very interesting as areas at different distances fade at different positions.
Here is an example video I made many years ago with the colors inverted as well for visibility: https://youtu.be/k2-ZZz5rwQE?si=UaKcidDRbNZOftbd