Creating Stereograms

What are Stereograms?

Stereograms are 3D images that are hidden in a 2D image. Sounds unbelievable, take a look at the Stereogram below.

Hand Stereogram
If you cannot find the hidden image you should check our page on how to find hidden images. Stereograms are quite addictive as the open up a new world on your computer monitor, it seems so clear and fascinating, it is also used as a meditation tool in India.In this post I will quickly run through how you can create 3D images.

How Do I Create 3D Images?

In the 1960’s, a psychologist, Bella Julesz made 3-D pictures with apparently random dots to see if people could perceive distance without any clue such as size.

Alphabet 3D Image
In the real world, we use our binocular vision to perceive distance. Each of our eyes sees a slightly different picture of the scene viewed. The brain, through experience, has learned to interpret the two flat images into a three-dimensional one. We have had the capability of viewing flat pictures in 3-D since the stereoscope was invented by Sir David Brewster of England in 1849. Older readers will remember the stereopticons that people and schools used in the last century and the first part of this century.

You can make your own 3-D pictures fairly easily. Consider the following chart:

Creating Stereograms

Bring your eyes close to your monitor such that each eye sees the two asterisks separately; move your eyes until two of the four asterisks are superimposed so that you see three asterisks.

Then slowly move away from the monitor so that the combined image comes into better focus. You should see what appears to be three levels in the scene. The A’s appear to be in the middle level and some of the B’s are in front of the A’s, and some of the B’s are behind the A’s.

You can see that the A’s are spaced at equal distances (10 spaces between them) but the B’s are alternately spaced: 11 spaces then 9 spaces. What is happening is that one eye sees one B and the other eye sees an adjacent B slightly offset. The brain tries to interpret this as one B at a nearer or farther distance than the A’s.(Note: If you are using a browser that allows you to change the font size, the 3-D effect will probably be easier to view using a small font.)

We don’t have to space the B’s at alternately different separations. If we make them closer or further apart than the A’s we can trick the brain into thinking they are nearer or farther. Horse 3D Image
Create Text Stereograms:

There are a few sites on the internet that easily allow you to add text to an image by just following a simple set of instructions.

Of course the method above that can be found in elaboration over here, enables you to create your own kind of stereograms.

Create Your Text Stereogram

Stereograms:

The Knight Stereogram

Skull Stereogram

More Stereograms

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