Visually, a sterogram appears to consist of a vertical image repeated across
the stereogram. The algorithms used to create stereograms modify the vertical
strip in each repitition to include the 3D content.
These background strips can be random dots, text, or images. The most popular
type of stereogram are those which use images in the background. The results
are far more pleasing to the eye and easier to view than either the text
or ranodom dot stereograms.
Any image can be used as a backgroun for a stereogram. In selecting an image
to use, the following guidance is offerred:
- One inch is a nominal image width
- Width of the image should be at least as wide as the greatest stereo separation
(see the algorithm discussions for more information about stereo separation widths)
Here is a selection of various textures used in stereograms. I've accumulated
these as I've learned about stereograms. Unfortunately I did not track where they
came from. Over the next few weeks (today is 30 April 2006) I'll try to locate the
sources and post credits as appropriate, as well as remove any images for which I
cannot get approval to post.