How Stereograph 3D Images Work – Then and now
Stereoscopes and stereograph cards were a popular form of home entertainment from the 1860s into the early 1900s.
Each stereograph card carries two nearly identical photographs, one meant to be seen only by the left eye and the other one for the right. When viewed with an old-fashioned stereoscope, the brain combines the two images into a single three-dimensional scene.
Today these old stereographs can also be adapted for computer screens. Red-cyan glasses separate the left-eye and right-eye images again, allowing the versions shown on this page to recreate the depth effect without an original stereoscope viewer.
Controls:Mouse wheel: enlarge any imageClick-and-drag: move enlarged imageClick caption: full-screen mode'L' / 'R' / 'S': left, right, stereo