Why are 3D glasses red and blue?

Question

I want to know why they are red and blue. And if it matters what eye is looking through what color. (ex. right eye has to look through red)

Answer 1

Basically humans have what is called binocular vision. We have two eyes and we use the difference in images received by the two eyes to work out depth - i.e. construct 3D images.

Movie screens are flat 2D so you can't see 3D. In a 3D movie you simulate real life by putting two images on the screen in different colors. Normally one red, and one blue.

You then wear glasses with filters in them - red and blue - so that one eye can only see the red image, and one eye can only see the blue.

Because you have two slightly different images fed to your brain through each eye, as in real life, your brain then reconstructs the images as 3D.

Answer 2

some 3d glasses are indeed red and blue, because a red filter won't let blue images through, and a blue filter won't let red images through... you then print 2 images on the same page : one blue and one red, taken from slightly different angles and the glasses will let your eyes see only 1 image each... for example, the left eye will see the blue image if you put the blue glass in front of it, and the right eye will see the red image...

The probleme is, if you put the glasses the wrong way, you'll know it right away, because the feelings of depth will be reversed compared to what the image should be like : if you feel you're watching a doorway from the outside and you feel the inside is closer to you than the outside, put your glasses the other way around...

now, if you want to watch a COLOR movie in 3d, you'll be having trouble with colored glasses... That's why we invented "polarized glasses".
The basics are just the same : you chose 2 types of light which only 1 eye will be able to see at a time (because of the goggles). And scientists noticed that lasers produce what they call "polarized light". And they also found out, that if they give 1 given polarity to the light beam of a laser, then they only have to put a 90°-polarized filter to block that light completely. But to do that, they need to project the movie using polarized light (unlike normal cinema) and project 2 images (one for each eye) using 2 different polarities (90°).

So when you look at a 3d image in a magazine, it can only be in blue-red 3d because natural light is not polarized. But when watching a movie in a special cinema theater, you will get polarized goggles.

Answer 3

3D glasses were originally made in red and blue back in the 50s and are still used to this day. The combination I really don't know, how ever it does matter which one is which, but it depends straight on the 3D picture portrayed, or film.

The main object of using colors was that when 3D films were shown, two projectors with different color tones were displayed on a screen. One color tone would be pale blue, and the other film had a warm red color tone, and both were portrayed with a slight difference, so without the glasses you would look at a blurry picture on screen, but using the glasses corrected the image, and gave you a perception of 3D viewing. (One image was slightly off focus from the other, but just enough so that it would cause the 3D sensation on the viewer).

Later studies changed the 3D glasses from color to polarized lenses. Basically it makes one lens differs from the other on contrast (ideally it reflects light in a different tone, like one lens reflects a pale white tone while the other reflects darker tones). At least this is what I have found every time I've visited 3D films.

When you don't use red-blue glasses, and use polarized, that enhances 3D viewing cause you don't mess with the film's original color, but rather the brightness and contrast of it, and gives out a very realistic 3D view.

Answer 4

The way regular vision works is our eyes see two separate images that are slightly different (each eye sees from a slightly different angle). Our brain then combines the images and it figures out depth of vision (i.e. how far away something is, how tall etc.) Normal movies can't be seen in 3d because they are a flat image projected onto a screen. But 3d movies fool our brains.

If you've ever seen a 3d movie without glasses you'll notice it looks fuzzy or out of focus. Because it is actually two different images projected slightly apart. There's a red part of the image and a cyan (or blue green) part. Here's where the glasses come in. The glasses are colored red and blue (one lens per color). As you might know if you look through a red lens you can't see red things only other colours and vice versa for blue. and this is the key to 3d glasses. When you put them on and look at a 3d image the red lens on the right side blocks out the red in the image allowing you only to see the cyan in that eye. The blue lens blocks out the red etc. Since the images you see from both eyes are now slightly apart (just like they are in normal vision) your brain is fooled into combining them to form 3D vision just like it would with anything else you see.

Answer 5

There are three current mainstream 3D technologies, they all rely on two slightly different images being seen by different eyes. Red Blue: Two images captured with different tints. The glasses have red or blue gels (colour filters) in them which only allow that eye to see the other colour. Passive Digital (mostly at cinema): Two images captured but the output is polarised (light wave is only oscillating in a single "direction"). Each lens of the glasses is then polarised which mean it stops any of the light waves that are polarised in the same direction. If you want to test this, next time your at the cinema with a friend get both pairs of glasses, look through both and rotate one pair. You'll see that when one is vertical and one horizontal all light is blocked. Active Digital (mostly on home TVs): Two images are captured but are unchanged. The magic happens with the device output. Your eyes see at around 48Hz (they take a picture 48 time a second), 3D TVs are able to refresh at around 300Hz. So the TV alternates the image show (left and right) faster than your eye could perceive, if you looked at it without glasses it would just look like two images on the screen. The glasses alternate blocking light on the left and the right at the same rate that the TV does, so your left eye sees only the left image and the same visa versa. There are other 3D technologies out there for example the Nintendo 3Ds which uses a parallax barrier.

Answer 6

Because they are "opposite colors". Blue light will not travel through a red lense and visa versa. The 3d image has the right eyes image coded in blue, and the left eyes image coded in red. The images are superimposed over each other and then viewed. Only the image for the correct eye will get through, giving an illusion of a 3d image. If the lenses are reversed the illusion will not work.

Answer 7

I did not know they were red and blue.. The 3D glasses I had were clear glass.. no colors ???

Answer 8

because it enhances the eyes
red and blue colors are the best example that tranforms 2d into 3d

Answer 9

so that they each let in a different view of the movie. two camera's i think 52 degrees apart film the movie and they overlay the two films together. wearing the glassses allows your brain to see one shot form the left and the other from the right and your brain then combines them together and you end up seeing a 3D image.

Answer 10

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