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How to view 3D
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How to view 3D

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You can watch 3D with or without glasses. The technique used for watching without glasses is called "auto stereoscopy".
There are such limitations in resolution, viewing angles and problems to apply live 3D footage, but we will not bother with that now.
All other techniques use glasses and that will be the case in a foreseeable future. Get used to it.

3D is basically two photos shot at the same object with an horizontal axial distance. One picture for the left eye and one picture for the right eye. This is done to copy the human eyesight. The slight difference in perspective is what gives the illusion of stereoscopic vision. The two shots, representing the left and right eye, are treated as separate media, through the whole production process until it is being displayed. On the screen or at the 3DTV the two shots finally are displayed baked together as one. You need the glasses to separate them back again so the left and right eye can see the images intended for them. Your 3D master can be encoded for any or all of the various viewing systems.

Three flavours of shutter-glasses

The technically best separation is made by so called Shutter glasses / active glasses. The 3D projection or screen flash rapidly alternating images from the left and right eye. The glasses open and close shutters over each eye so the eyes see only the image intended for it.

 

Real-D Dolby

Using the Circular Polarized system, like Real D, the two images separated by using polarized glasses.
The Dolby / Infitec systems are using a intelligent separation in colors using nano technology. Both eyes having RGB but the colors are separated in to different wavelengths, one set of wavelengths for each eye.

 

Anaglyph - red/cyan
ColorCode

The old Anaglyph glasses use a very rough separation based on Red and Cyan which corrupt the color-information. This is the worst but most widely spread system. A better separation is done by the ColorCode system in which there is a separation of colours for one eye and depth cues for the other making it more true to the original colors.  These systems are at the low end of the scale, but currently the ones best suited for usage on the web, on print and on regular TV sets.