What are anaglyph 3D images?


Anaglyph 3D is the name given to the stereoscopic 3D effect 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 cortex of the brain fuses this into perception of a three dimensional scene or composition.


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Anaglyph images have seen a recent resurgence due to the presentation of images and video on the Internet, Blu-ray Discs, CDs, and print. Low cost paper frames hold accurate color filters that typically, after 2002, make use of all 3 primary colors.

The current norm is red and cyan, with red being used for the left channel. The cheaper filter material used in the monochromatic past dictated red and blue for convenience and cost. There is a material improvement of full color images, with the cyan filter, especially for accurate skin tones.

Video games, theatrical films, and DVDs can be shown in the anaglyph 3D process. Practical images, for science or design, where depth perception is useful, include the presentation of full scale and microscopic stereographic images. Examples from NASA include Mars Rover imaging, and the solar investigation, called STEREO, which uses two orbital vehicles to obtain the 3D images of the sun. Other applications include geological illustrations by the United States Geological Survey, and various online museum objects. Anaglyph images and videos have also become extremely popular for advertising...

Source: http://en.wikipedia.org/wiki/Anaglyph_3D

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