There are various methods for viewing stereoscopic picture pairs, but by far the most popular one is the use of anaglyphs. Everyone knows the famous 3D-glasses with their typical red and green filters which almost became synonymous with the idea of stereoscopy itself.
Compared to the general fame of anaglyphs, oddly enough many enthusiasts and connoisseurs of three-dimensional pictures have a low opinion of this method. They seem to ignore the fact that just this technique made it possible to show stereo slides and — later on — also stereo movies not only to one single person but to a large audience at the same time.
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