3D - 2

How does red/blue lense of 3D glasses make it work?

Public Comments

1. The red and blue filters show slightly different images to each eye; essentially like we see the real world, so it tricks the brain into "seeing" in 3d. Here's an impressive one for you: http://www.callipygian.com/3D/corpseplant.jpg
2. There are two images in the picture, one tinted toward the blue and the other toward the red each taken from slightly different angles. Each eye can only see the colours which are not filtered out and your brain uses the different images that each eye sees to create the perception of depth.
3. The key to 3D is having each eye see a different image, a different view of the same scene. In the old method, you used a red image and a green image, and red and green eye filters, so that each eye sees one image. The colors are very distracting, though. In the Polaroid process, one full-color image is vertically polarized, and the other is horizontally polarized. When you look through filters 90° off from each other, you get a full-color 3D image.
4. i belive the simple answer is...the screen displays the image from two perspectives ie, one of the image viewed from the left which is blue the other the same image if it were viewed from the right which is red. wearing the glasses means that one eye only see one the blue image and the other only the red this fools your brain into thinking it is getting both a left and right perspective of the image giving the perception of volume...
5. The red and blue filters enable the viewer to see any one part of special images with only one eye. This introduces a small visual disparity in the position of the picture seen in either eye. This tricks the brain into thinking the image is 3D as 2 images are seen of the same picture and they appear to come from slightly different positions in space. If you look at an object infront of you left eye it will be at a different distance to the apex of your right eye. The brain uses information about the angle that the right eye rotates to estimate the distance of the object giving rise to depth perception. It is this same principle that is used when producing 3D images. How detailed do you want to go? The next stage in perceiving 3D concerns the brains ability to fuse images with disparities into one but this requires anatomical knowledge. Google Panum's area if you want to learn more. This is the area in space where all images appear as one.
6. Great answers above...the modern 3-D movies use polarized lenses instead of red/blue, but the principle is the same (each eye sees a different image in the screen). Great movies in IMAX!