An anaglyph image is a 3D image printed or displayed on a screen that can be viewed in 3D using special anaglyph glasses. These glasses are equipped with a red and a cyan or blue foil in front of the eyes, the images are usually black and white, sometimes also in colour, whereby the image for the left eye is cyan and the image for the right eye is red, i.e. exactly the opposite colour to the colour of the glasses foil. The images are printed overlapping on one side.
As one image in front of each eye disappears through the colour filters, a three-dimensional image is created.
Further information can be found on Wikipedia: https://en.wikipedia.org/wiki/Anaglyph_3D
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