Stereoscopic photography is not new. Photographers have been creating 3D images using this technique as long as cameras have been around (have a look at the history of photography and digital photography here).
There's also lots of tips and tricks on how to achieve the effect with digital photography (it's far easier with digital photography than traditional photography), plus a “trainer” image.
If, after reading through the pages on stereoscopic photography here, you'd like to have a go at 3D digital photography yourself, have a look at how to make a 3D photo.
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Stereoscopic vision works on a basic principle – the fact that we have two eyes that are a few inches apart.
This means that when we look at anything the image seen by the right eye is slightly different from what we see from the left eye.
Have a look at the diagram below to see how this works:
The separation of our eyes creates a triangle between the thing you’re looking at and your two eyes. With this your brain calculates the distance of objects within the scene. This gives us our 3D vision.
As a test to see how well this works, cover one eye and then reach for something on your desk. Do it now!
Weird feeling, isn’t it?!
With one eye closed off your brain is unable to “triangulate” the exact distance of objects. As your hand goes to grab that object you have to stop and really think. Your stereoscopic vision is gone.
The brain can adapt
You will still be able to grab that object, because your brain will fall back on its experience to help you out. It just takes a little longer, and means you have to think a little harder to do it.
Ok, you can uncover your eye now!
. . . and there's more . . .
In the diagram above the left eye and right eye form a triangle on the flower. This means the brain can work out the distance to the object. If you reach for the flower, you brain can tell you how far to reach.
But there’s more to stereoscopic photography, and our own stereo vision, than simply distance.
Go back to the diagram above. The left eye and right eye also view different sides of the flower. Follow the arrows and you will see that some parts of the flower can only be seen by the right eye, and some parts only by the left.
It’s this extra piece of information that creates a true 3D effect. Your brain will take in the information from the left eye, combine it with information from the right eye, and then piece all of that together to form a true 3D picture.
How is it done in digital photography?
For stereoscopic photography to work what we have to do is recreate the two images that would have been seen by the left eye, and the right eye. This means taking two almost identical pictures.
In simple terms, one photo of a scene is taken by focusing the camera through the right eye. Then the photographer moves the camera to their left eye and retakes the scene. They now have two pictures, one taken “through” the right eye, and one “through” the left eye.
You then view these two images side by side. It does take a little work by the brain to piece them together again. It’s odd at first, but your brain can be trained!
That's the theory behind stereoscopic photography. To produce 3D photographs yourself, you will need a little more guidance. All you need is right here on these pages though! So, delve in, and have a go at 3D stereoscopic digital photography!
Sidebar 1 . . .
If you are interested in stereoscopic photos, you'll probably be interested in 3D with glasses too. Take a look at Rainbow Symphony Inc. - Manufacturer of 3D Glasses, Eclipse Glasses and Fireworks Glasses, Free 3D Glasses Available and a Large Collection of Stereoscopic Images.
Sidebar 2 . . . One of the best things about digital photography is sharing the photos you take. The trouble is, because we end up taking so many of them, it’s so easy to lose track of them all.
I don't know about you, but my hard drive is stuffed full of photos!
I recommend you give Google’s Picasa a try. It will not only organise your photos, but will perform minor edits too.
It’s all some photographers need, and best of all, it’s absolutely free!
Picasa comes as part of the Google Pack. If you don’t want the rest of the pack just de-select them when you get to the download screen.
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