Simple algorithms for creating random-element stereograms on the Macintosh

Traditionally, the creation of random-element stereograms is a computation-intensive process. However, by taking advantage of routines built into the Macintosh operating system, multiple-depth stereogram anaglyphs can be easily created from any black-and-white or grayscale image. Any complex shape can be selected from the pattern and offset in one eye’s view relative to the other’s to create the illusion of depth, without the need to calculate offsets on an element-by-element basis.