Anaglyph 3D Movies
Anaglyph 3D (from the Greek anáglyphos-relief) is a method for obtaining a stereo effect for ordinary images by using color coding of images intended for the left and right eyes. To get the effect, you need to use special (anaglyphic) glasses, in which instead of diopter glasses, special light filters are inserted, as a rule, for the left eye — red (red), for the right — turquoise (cyan). A stereo image is a combination of images of a stereo pair, in which the red channel shows a picture for the left eye (the right one does not see it because of the light filter), and in turquoise (blue-green)-for the right one. That is, each eye perceives an image colored in the opposite color.

The main disadvantage of the anaglyph method is incomplete color reproduction. The resulting three-dimensional image, due to the effect of binocular color mixing, is perceived as monophonic or (at a certain brightness ratio) achromatic. The adaptation of the observer to the specific conditions of perception occurs quite quickly. However, after a not so long (about 15 minutes) stay in anaglyphic glasses, the observer's color sensitivity decreases for a long time (about half an hour) and there is a feeling of discomfort from the perception of the ordinary world.

This method of transmitting 3D images is already out of circulation. In cinemas, it is no longer used due to poor color reproduction, but the ease of use allows you to organize 3D viewing with minimal investment.