An anaglyph (from the greek anáglyphos composed of ana, above, and gliphein, carve, chisel) is an image obtained by superimposing the two frames of a stereogram stained with two different colors, For example, red for the right image and the green to the left image.
Thus observing the image through lens colors similar (red for the right eye and green for the left eye), we obtain that the right eye sees only the right eye image left image left alone. Over time
have been used several pairs of colors. The red-green pair to work quite well with the printed images, even if the image seen through the glasses tends to appear yellow. In the field of cinema, the first experiments were made with the yellow-blue pair, but in this case, in addition to a change in color, it is difficult to get images without ghosting (Ghost). The red-cyan pair combines all three primary endpoints: the image is intended in the left eye is filtered to contain only the contributions green and blue (ie, cyan), while that given the right eye is filtered to include only the charges related to red. The combination left and right image is displayed on the screen and the colored lenses of the glasses act as filters, allowing each eye to perceive only the image intended for it and preventing the perception of the image intended for the other eye. The red-cyan pair allows you to have a fair representation of color and a neutral vision of black and white images.
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