Anaglyphs are a class of stereo 3D images created from two photographs taken from two different points (about 2.5 inches apart -- the typical distance between human eyes). The stereoscopic 3D effect is achieved by means of encoding each eye's image using filters of different (usually chromatically opposite) colors, typically red and cyan. Anaglyph 3D images contain two differently filtered colored images, one for each eye. When viewed through the color coded "'anaglyph glasses", each of the two images reaches one eye, revealing an integrated stereoscopic image. The visual system of the brain fuses this into perception of a three dimensional scene or composition.
Viewing an anaglyph 3D stereo image is easy. All you need is a red filter over your left eye and a blue, or Cyan filter over the right eye. Actually any colour could be used for the left and right images of an anaglyph, but for viewing full color anaglyphs, the Red/Cyan combination is best. Once you have the filters over your eyes, just relax and allow yourself time to get into the picture. Your eyes will cross slightly as the image comes into 3D focus. Please understand that the 3D effect only works in the horizontal plane, so moving your head from side to side will aid in seeing deeper into the image. Turning off the lights in yhe computer room will also enhance your experience
There are many different types of glasses now available for viewing anaglyphs -- from the inexpensive cardboard types, to the moderately priced ones I bought through ebay (Rs 99/- only). These new glasses are definitely worth the money, and there are many stereoscopic 3D websites on the internet with stereo images you can see for free, along with many posters and even movies on youtube.
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