First of all, Blade Runner is without a doubt my all-time favorite movie, I've seen it countless times, and still enjoy every second of it. But there's one scene that I still wonder about every time I see it, the Esper Photo Analysis scene. Deckard finds a stack of photos while searching Leon's apartment, as he's browsing through the photos, one of them catches his eye. What exactly it was about this photo that made Deckard so interested in it, I have no idea. Anyways, later on, Deckard is in his apartment, and pops the photo into the Esper machine. He starts calling out grid commands, zooming in on different things within the photo, and eventually zooms in on a mirror. That's when it gets odd.
The angle at which he's looking towards the mirror starts changing. He sees things that weren't previously visible, and not just small details, entire people, rooms even. He manages to somehow locate Zora within the photo. It wasn't like Deckard simply zoomed in on her reflection within the mirror, he was definitely rotating his view.
My question is, is this technology ever explained? Or is it just shrugged off as "technobabble"? I've played through the 1997 BR adventure game, which at points requires you to search photos for clues using the Esper machine, but it doesn't offer any explanation on how it works. I never read the Phillip K. Dick novel, so I don't know if it contains any kind of explanation. It's just interesting is all. It's like their photos, when taken, store everything that was going on around the central subject. Maybe I'm reading the scene wrong, or maybe I'm over-thinking it. After all, it's just a movie.
Any theories/insight would be appreciated!