3D viewing methods:
Use of a trained
pair of eyes
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3D viewing methods: |
Here begins the area of stereoscopic images, resulting from two shootings (see "Anaglyph, what a hell is that?" et "Stereoscopic shooting"). Both images of a stereo-pair can be viewed as presented. Following are the two "free vision" methods requiring no tool:
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Parallel viewing: The two images stand side-by-side. The image corresponding to the left eye is on the left side, and the right image at the right side. Although it seems natural, it is not possible to use a pair of big images because our eyes are not able to diverge such a way. |
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Crossed viewing: In that case, images the right image stands at the left whereas the left image stands at the right side. It is not easy to "cross the view" but that methods allows the observation of pairs of big images. |
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L-R-L or R-L-R: One of the two images is repeated once though it is possible to view both parallel and crossed ways selecting 2 out of the 3 images. |
Between the parallel and the crossed viewing, there are perpetual fights among pros and cons of either one or other method. Some just considers the "crossed" one and others only the parallel. Others, like me, are not able to cross the view, so unable to cross-view. Some others, too familiar with cross-viewing can't anymore see parallel pairs. In order to all those people to agree, there is a lot of devices to facilitate the viewing of both kind of pairs. Those apparatus, called viewer, will be seen in the next chapter. But before switching to those helpful apparatuses, one more method is remaining for top-trained eyes.
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Stereograms et autostereograms: They consists of 2 dimensions images of drawings witch can be seen as 3D when looked a certain way. Maybe you remember some years ago, that world-famous "magic eye". These are Single Image Random Dot Stereogram (SIRDS) and you can see a nice exemple following that link or a nice collection in the Webpage of Dominique Notteghem. |
Main menu 3D viewing methods menu
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