anaglyph

An anaglyph is a stereoscopic image that creates a three-dimensional effect when viewed through specially colored glasses. This technology is rooted in the principles of binocular vision, where the brain combines slightly different images from each eye to perceive depth.132

In anaglyph photography, two images of the same scene are taken from slightly different angles, mimicking how the left and right eyes see an object. These images are then superimposed, with one typically in red and the other in green or blue. When viewed through glasses with corresponding colored filters, each eye sees only its intended image, tricking the brain into perceiving a three-dimensional scene. This technique is a method of creating stereoscopic pictures, a broader category that also includes other technologies like those used in 3-D movies.213