What actually makes 3D work? Why the red and blue? And the doubles images?
In: Technology
In real life, the information that each of your eyes receives is slightly different because they occupy different positions in your head. Your brain takes both sets of information and combines them to form your picture of the world.
With a 2D image, both of your eyes receive the exact same information so it appears flat.
A 3D image forces your eyes to see different images, mimicking what is happening in real life, and your brain can construct a seemingly 3D image out of it. With the red/blue scheme, there are two images: one red, one blue.
The red lens of the glass filters out the red image, so that eye only receives the blue image. The blue lens of the glass filters out the blue image, so that eye only receives the red image. Your eyes are now receiving different images which your brain can use to construct a 3D mental picture.
Today with modern technology in movies, the screen is showing you two pictures. Each picture is using a different kind of light. The glass lenses are now more like sunglasses lenses which filter out specific kinds of light. The result is the same: each eye only receives one of the images.
Your brain measures distance by comparing the difference between the images your two eyes see due to the difference in their point of view. 3D glasses work by showing each of your eyes a slightly different picture to make use of that. The color glasses work by only letting one eye see either blue or red parts of the image.
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