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An anaglyph image consists of two different images combined in to one. The two images are those of the same subject as seen by the left and right eyes, and are encoded using chromatically opposed filters - typically red and cyan or red and blue.When viewed through anaglyph glasses, each lens having a different colour filter, the two images are separated and each one is seen by only one eye. An alternative approach is to separate the two images using polarization. The presentation to each eye of a different image captured from an appropriate viewpoint allows the brain to process the information into a three dimensional scene.

Image of Mars courtesy NASA/JPL-Caltech

The image above, which is a 360 panorama of the surface of Mars captured by the Opportunity rover, should be viewed using 3D red/cyan or red/blue anaglyph glasses.

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