If you haven’t been successful in viewing stereograms (either cross or parallel) and want to give it up, here’s a simpler technique to get the same experience without straining your eyes. It is called the anaglyph technique. Here, the two photographs are overlapped before hand, so you don’t need to strain your eyes to view it. Instead you use a color filter to view them. Here’s a link for some examples.
Go to the above link and observe the images before you move further. The concept works like this; each color filter that your glasses have should match the color component preserved in one of the two images. The single image that you see in this link is created by taking red component form one image and green component from the other and overlapping them. For example if you are using a red-blue glass combination, one of the images should have blue and not red component in it and the other should have red and not blue component. I assume that you all know a color image is a mixture of three layers; Red, Green and Blue. When you overlap the two components it will look blurry without the glasses due to the disparity present in stereo images. When you look through these glasses one of the components in the image will be filtered by each of the eye piece and so the same image will not reach both the eyes, which your brain resolves to perceive depth. It is equivalent to seeing two images either crossed or parallel. Now you know why they give you these colored glasses when you go to watch a 3D movie.
People interested in photography can take their own 3D photographs using their single 2D camera. Landscape photographers would be very excited to take such photographs, because it is very difficult to reproduce the 3D landscape effect in a 2D photo. Here are some of the ways to do it.
If you find the explanation in the above links too complex let me know, I can put it in a much simpler way.
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