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Adding some depth to the blog... !
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Location: Blogs Sly Comments |
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| Posted by: Emory Schley |
2/27/2007 5:54 PM |
Did you know you could look at those 3D picture pairs that normally require a stereoscope and if you do it just right, you can see them in full stereo, without the stereoscope? It’s called “freeviewing.”
It’s true, this is not a joke. Lots of people know how to do it. If you remember the old Magic Eye® cards and posters from a few years back, you can use the same approach on real stereoscopic pairs.
Each photo in a stereo pair appears to be an exact twin of the other, but they’re not. A 3D camera has two lenses, just like you have two eyes. Each picture is taken from a slightly different viewpoint, and in comparing the two images, your brain measures those tiny differences and translates them into a perception of depth. Stereo photography emulates this natural process, but you have to “trick” your brain into seeing the two separate photos so the differences can be compared.
I’m including some pictures here that I took at Rainbow Springs over the weekend for you to practice with.
There are lots of other 3D photos on the Internet. You’ll find some are anaglyphs which need those red- and cyan-lensed glasses to see. Then there are two different types of side-by-side stereo photos: They are called either “parallel” or “cross-view” depending on where the right and left photos are placed. What you’ll find here are the “cross-view” type, because those are the easiest for most people to view.
With cross-view pictures (they’re also called “cross-eyed”), you focus on a point in front of the two photos, and with “parallel,” you focus on a point behind the photos. If you use the wrong technique, you’ll just see pseudo-stereo, which just means the depth will be reversed: Background stuff will come forward in the photo, while foreground stuff will recede into the background. No harm is done, it just looks really odd.
Practice with these photos, and once you’ve mastered the technique, you can find lots of other cross-eyed examples on the Internet to keep you entertained for hours!
WHAT IS IT?
Freeviewing is the practice of looking at a stereo photo pair and seeing it in 3D without using a stereoscope or any other physical device. It’s really not difficult to do. Stereo photos come in pairs, one for the right eye, and one for the left eye.
HOW DOES IT WORK?
Stereo photography emulates human vision. You have two eyes separated by a short distance. Stereo photography utilizes pairs of photos, each shot from a slightly different angle, emulating the distance between your eyes. To see them in 3D, you have to learn to converge the two images into one. It’s fairly easy to learn.
HOW TO DO IT:
Here’s how to see cross-view pairs in 3D: First, click on one of the two thumbnail icons above to bring a pair of photos up on the monitor’s screen. Sit about two feet directly in front of your monitor with your head level.
Hold your thumb in front of you like you’re giving a “thumbs up” to someone. Line your thumb up at the bottom of the vertical black bar separating the right and left images. Concentrating on your thumbnail, but being aware of what’s happening behind it on the screen, slowly pull your thumb towards your nose. Keep focusing on your thumbnail, but pay attention to the screen behind your thumb. As your thumb pulls slowly toward your eyes, a third picture will begin to form between the first two, first as a narrow vertical strip, then it widens as your thumb draws nearer to your face. At some point when your thumb is about 8-12 inches away from your face, the center photo should be completely formed. Carefully shift your vision from your thumbnail to the middle picture, and you’ll see it’s in 3D!
If you have trouble with that procedure, then try this alternate approach: Don’t use your thumb. Just concentrate on the black vertical bar separating the two views. Relax and cross your eyes slightly (like you’re looking at some object several inches in front of you) and keep it up until you see three pictures. The one in the middle will be in 3D. You may have to refocus on the middle image somewhat. It may take you a try or two to succeed, because you’re learning something new here, but a few minutes of practice will work wonders.
If neither of these two methods work for you, you can find still other tutorials on freeviewing by visiting:
http://bellsouthpwp.net/s/p/spidernaut/3D/3d_freeviewing.htm#parallelmethod1 and scrolling down a bit for a list of other explanations on freeviewing.
I plan to post scenes taken around Beautiful Marion County here from time-to-time. Don’t get left behind – bring a little depth to your computerin’! |
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