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What is 3D?

3D means three-dimensional, i.e. something that has width, height and depth (length). Our physical environment is three-dimensional and we move around in 3D every day.

Humans are able to perceive the spatial relationship between objects just by looking at them because we have 3D perception, also known as depth perception. As we look around, the retina in each eye forms a two-dimensional image of our surroundings and our brain processes these two images into a 3D visual experience.

How 3D works in cinema?

With 2 special projectors, this broadcasts two separate images in same time on one screen. 3D video adds stereoscopic vision, meaning that two separate images are shown simultaneously - one to each eye. In cinemas with older technologies broadcast dichromatic colored image, then filter it for each eye through two-colored glasses (red/ cyan). That is why watching it without glasses doubles the image, because both images are seen by both eyes.

How does 3D works in TV?

With regualar TV - 3D can be viewed by using two- colored “anaglyph” technology. The video has to be watched with glasses with two colored spectacles. With new 3D TV a different image is broadcasted to each eye and is watched by 3d active glasses (polarized glasses), depending on the options of TV or cinema.

When 3d glasses are with blue and red spectacles?

Two parallel images are covered one over another, coloring each image in its own color, then they are filtered through special “anaglyph” glasses (each spectacle in different color).  From a two colored image one spectacle can only see one color, in this way, each eye sees a different image.

Why some glasses are with different color spectacles?

Two colored images is not a perfect technology. It’s obsolete, and you can’t see a movie in its true colors and the image visibly doubles. It uses different colors to minimize damaged colors and doubling.

What glasses are given in cinema?

Glasses can be two colored paper glasses or plastic polarized or activated glasses, they are more expensive and have to be careful not to brake them.

Do the glsses we use watching 3D TV  differ from those in cinema?

No.

Can you convert 3d file to conventional viewing regime, without 3D effect?

Yes, but you will lose advanced feeling of depth. It will be like watching normal television.

Can you convert conventional video files and view them in 3D?

Yes, but it won’t be real 3D, it will be simulated and may not look right.

What are polarized 3D glasses and what does word polarized mean?

Polarized 3D glasses create the illusion of three-dimensional images by restricting the light that reaches each eye, an example of stereoscopy which exploits the polarization of light.


To present a stereoscopic motion picture, two images are projected superimposed onto the same screen through different polarizing filters. The viewer wears low-cost eyeglasses which also contains a pair of different polarizing filters. As each filter passes only the light which is similarly polarized and blocks the light polarized in the opposite direction, each eye sees a different image. This is used to produce a three-dimensional effect by projecting the same scene into both eyes, but depicted from slightly different perspectives. Several people can view the stereoscopic images at the same time.

What are 3D anaglyph glasses?

A pair of eyeglasses with two filters of the same colors, once used on the cameras (or now simulated by image processing software manipulations) is worn by the viewer. In the case above, the red lens over the left eye allows only the red part of the anaglyph image through to that eye, while the cyan (blue/green) lens over the right eye allows only the blue and green parts of the image through to that eye. Portions of the image that are red will appear dark through the cyan filter, while portions of colors composed only of green and blue will appear dark through the red filter. Each eye therefore sees only the perspective it is supposed to see.