Instructables
Picture of How to view stereo graphic images
Stereo graphic images can be viewed as though looking to the horizon through a window. If the two images are spaced at the right distance, the 3 Dimensional image will come into focus when the eyes are most relaxed.
 
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Step 1: Start with the images

Picture of Start with the images
Start off staring at the two images.

Step 2: Relax Eyes

Picture of Relax Eyes
Now completely relax your eyes and go out of focus (focus on the horizon).
Tilt your head until you see three images line up like so.

Step 3: Focus On the Center Image.

Picture of Focus On the Center Image.
Now focus on the details inside the center image.
Tilt your head if needed and view image as though looking through a window.
Relax and the center window will come into 3D .

Step 4: May need to Scale the Images

Picture of May need to Scale the Images
The 3D viewing is easiest when the width of one picture equals the distance between the eyes. Sometimes a image may need to be scaled in size to do this.
fedecale5 years ago
whoa this make me go tripping
locofocos5 years ago
I can see CES's fine, but I can never see these PES's. I am able to look past them and they start to come together, but I just can't get them close enough (by looking far enough back). For me, crossing my eyes is easy. I do wear glasses. My vision is good enough so I can read without my glasses. One of my eyes sees better than the other, so when remove my glasses, I'm suddenly not seeing one image slightly bigger than the other and my eyes get all confused...
rimar20005 years ago
There are another methods for viewing 3D images. You can invert them (left to right, right to left ) and seeing them with crossed eyes. These are CES (crossed eyes estereograms). Yours are PES (parallel eyes estereograms). There are anaglyhps, too, and others.
dsauer (author)  rimar20005 years ago
Do you happen to know what percentage of people have an easier time with CES vs PES?
No, I don't know the rates, but I know many people that makes it impossible to open the angle of convergence of the eyes. For me is difficult, and that I have spent some time practicing. Instead, it is much easier to cross the eyes, just seeing the tip of the nose.
You can see some of mine CES in www.flickr.com seeking RIMAR2000 3D. Or try http://www.flickr.com/search/?q=rimar2000+3d
dsauer (author)  rimar20005 years ago
I have a hard time using the CES method. For me the relaxed position seems to be focusing on the horizon with the eyes wide apart. If I scale the images to be the same distance as between my eyes, I naturally see three images with relaxed eyes. If I move my left thumb close the the left edge of the left image, it will will appear at the leftmost of the three images. That might be a good test to see whether the PES method is right for someone. How does a person who really should use the CES method see the two images with relaxed eyes? I suppose it could be possible to still see three images crossed eyed (with the images reversed).
Both methods (CES and PES) produce three images, which the middle is 3D. PES is appropriate when the images are small, ie the width of the same does not exceed 5 cm (2 inches). Larger sizes require more skill and/or training. I personally, see it is impossible when the separation exceeds 6 cm.
No, I don't know ther rates, but I know many persons that can´t open the convergence angle of the eyes. Instead, close that angle is achieved very easily looking the tip of the nose.

You can see some of mine CES in www.flickr.com seeking RIMAR2000 3D

Or try http://www.flickr.com/search/?q=rimar2000+3d