Working of 3D:
The 3D effect is nothing but an illusion to the viewer. To understand this , simply watch your hand with both your eyes, then close one eye as you keep watching the hand with the other eye. Now close this eye and open the previous one. Repeat this twice or thrice. You will see as if the hand is moving back and forth. This arises due to the illusion in visualising the hand with different eyes.
This is the basis for developing the 3D glasses. The movie screen actually displays two images. The glasses are designed to feed different images into our eyes. These let one of the images to enter one eye and the other image to enter the other eye. This is achieved using any of two ways: red/green or red/blue 3D glasses, and polarisation.
Red/green or red/blue 3D glasses
In this system, to produce the 3D effect, two images one in red and the other in green or blue will be displayed on the screen. The colour filters on the glasses filter only one image to enter each eye. But the image quality is not as good as developed by polarisation
However, the image quality with this method is not as good as with the polarised system. The reason is it somehow restricts some of the actual colours of the scene as it applies filtration by means of the colour itself.
Polarisation:
The two images are projected on the screen with polarized light with their plane of polarization in perpendicular to each other. If we look at the screen without any 3D glass we will see blurred images only as the two pictures are overlapping each other and both the image are seen together by both the eyes.
3D glasses use Polaroid with the plane of polarization in mutually perpendicular directions. So, when we wear the Polaroid glasses and look at the screen, only one of the image will be seen by one of the eyes and the second eye sees the other image. This creates the 3D sensation.
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