[elAhmo]

Does anyone know what is the technique they use in some of the documentaries where they use really old photos, but they make them look like this wiggle gram? I know it's not AI because the photos can be decades old, but they still do some stuff which that makes them almost see like 3D.

[fsiefken]

Perhaps you mean stereographs, if so they work because you get a separate photo for each eye up close, with a seperator, with or without lenses.

https://en.wikipedia.org/wiki/Stereoscopy

https://www.vam.ac.uk/blog/caring-for-our-collections/stereo...

https://news.library.mcgill.ca/double-takes-a-brief-history-...

https://restoreoldphotosnow.com/what-are-stereographs/

https://guides.library.oregonstate.edu/earlyphotoformats/ste...

Another method would be anaglyph, red-cyan or amber-blue dubois requiring similarly coloured glasses. https://adcnj3d.wordpress.com/the-science-of-anaglyph-3d/

[rtkwe]

I think that's a more manual process. An older version would involve cutting out the different layers of foreground and background and animating the movement with a bit of fill to add areas where there wasn't information in the original photo. Now I think there are some AI tools that can 'animate' old photos but they look more like movies with the look of the original photo over them vs the thing I think you're referencing.