![]() ![]() ![]() ![]() This is one of the reasons why stereograms were created. The advantage is, that you can see the object with all its colors on the right place, the disadvantage is that you can't create any large images, because your eyes won't manage to look at two images which are too far away from each other. These kind of images have an advantage and a disadvantage. How to make your eyes to do that is described in the "How can I see them?" part. The brain believes that your eyes are seeing two views of a single detail.īut how can you make your eyes seeing two different images while they are looking at the same screen (or page)? The easiest way is to create to different images for each eye and to look with the left eye on the left image and with the right eye on the right image. Your eyes see two different images, in which the objects near to you have a greater distance from each other, than the objects which are far away.Ĭorresponding points are the key: when one eye looks at a particular point in a stereogram, the other one looks at the corresponding (=shifted) copy of this point. Now continue shutting and opening your eyes and try moving your pen away from you: the "jumping distance" will decline. You'll see the pen "jump" from the left side to the right side (and back again). First the left, then the right, the left, the right eye, and so on. Just try and see: hold a pen (or one of your fingers) in front of your eyes and then shut one of your eyes. But objects which are near to you differ in their horizontal position. Things which are quite far away are nearly the same on both images. What happens when you see three-dimensional? With your left and your right eye, you see two slightly different images. With very few exceptions, anyone can learn to view stereograms! If at first you don't succeed, then try, try, and try again :-). Here is a nice stereogram for practicing (a pyramid comes out in the upper right corner there is a "3D!", in the lower left is a "Stereo"): But don't try to focus!! When you've reached the correct focus (3), stop and wait until you see the image. Now, start moving your nose away from the screen (slowly!) and watch the focus points (or the corresponding parts of the pattern) moving towards each other. Wait some time, so your eyes can relax while you are "staring" through the page at nothing in the distance. Here's another method: put your nose on the screen (or page - this method works better with printed images), so that you can't possibly focus on it. And these things can also be used as focus points. There are always corresponding things in the pattern, which can be recognized from the rest of the pattern. If there are no focus points, you can use the pattern itself. At this time you have to stop changing your focus and wait for the 3D image to appear. At a certain point, the left point of the one pair will cover the right point of the other pair (3). When you change your focus just a little, they'll duplicate and will drift away from each other (2). When you look at these focus points in a normal way, you see two of them (1). If there are focus points on (or above) the stereogram, you can use them to get the right focus. But after that, it takes me only a half a second to see them now. I must admit that it took me about thirty minutes to see my first stereogram. You have to look through the screen (I'll stop writing this "or page" thing now) as if you were looking at an object far behind your screen. Just relax and let your eyes go out of focus. An even greater feeling is creating your own stereograms (because you can create hundreds of them, so you don't have to stop viewing stereograms - you can even make a little stereogram animation). It is a great feeling looking at your first stereogram and seeing the impossible becoming possible (a 3D-image or 2D-page). There is another thing I should say about stereograms. However, when you look at it the right way, it becomes 3D! This means some parts of this image appear to be in front of the screen and some parts are behind the screen (or page). OK, a stereogram is at first just a picture on a flat screen (or when you print them on a flat page). "Stereo" means, that there are principally two images in one stereogram (one for each eye). First some information about the word: "stereogram" is a general word for images you might know as RDS (random-dot stereograms), SIRDS (single-image RDS), or as image-mapped stereograms. ![]()
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