3D films trick your brain, bringing projected images to life in fuol three dimensional glory. If you look at an object near you and close your left and right eyes in turn ,you will see each has a slightly different view of the surroundings. Your right eye alsees a bit more of its right side, and your left eye see a bit moreof it's left side. These two images are fused by the brain allowing you to see in three dimensions. This is known as stereoscopic vision.
To create a similar effect. 3D films are captured using two lenses placed side by side, or by producing computer generated images to replicate the same effects. In old fashioned 3D films ,footage for the left eye would be filtered using a red lens filter, producing a red image ,and the footage for the right eye would be shot using a blue filter, resulting a blue image. The images from the projectors are then superimposed on the cinema screen.
3D glasses with blue and red filters ensured viewers left and right saw the correct image, the red filter would only let red light through to your left eye, and the blue filter would only let the blue light through to your right eye. These two slightly different images are combined by the brain to create the illusion of 3D. The old fashioned 3D films couldn't make full use of the colour.
Therefore in modern 3D films ,polarised light is used instead of red and blue light.
A polarised light wave vibrates only on one plane. The unpolarized light can be transformed into the polarised light using the polarising filter.
A polarising filter has tiny parallel lines etched into it. These lines will only let the light vibrating on particular plane through. as with old fashioned 3D, the film is recorded using two camera lenses sat side by side. But in the cinema ,the two reels of film are projected through different polarised filters. So the images destined for viewers left eyes are polarised on a horizontal plane, whereas images destined for the right eyes are polarised on a vertical plane.
Thus these filters seperate out the two images,giving each eye sees a slightly different perspectives and fooling the brain so as to obtain a three dimensional view.!
To create a similar effect. 3D films are captured using two lenses placed side by side, or by producing computer generated images to replicate the same effects. In old fashioned 3D films ,footage for the left eye would be filtered using a red lens filter, producing a red image ,and the footage for the right eye would be shot using a blue filter, resulting a blue image. The images from the projectors are then superimposed on the cinema screen.
3D glasses with blue and red filters ensured viewers left and right saw the correct image, the red filter would only let red light through to your left eye, and the blue filter would only let the blue light through to your right eye. These two slightly different images are combined by the brain to create the illusion of 3D. The old fashioned 3D films couldn't make full use of the colour.
Therefore in modern 3D films ,polarised light is used instead of red and blue light.
A polarised light wave vibrates only on one plane. The unpolarized light can be transformed into the polarised light using the polarising filter.
A polarising filter has tiny parallel lines etched into it. These lines will only let the light vibrating on particular plane through. as with old fashioned 3D, the film is recorded using two camera lenses sat side by side. But in the cinema ,the two reels of film are projected through different polarised filters. So the images destined for viewers left eyes are polarised on a horizontal plane, whereas images destined for the right eyes are polarised on a vertical plane.
Thus these filters seperate out the two images,giving each eye sees a slightly different perspectives and fooling the brain so as to obtain a three dimensional view.!
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