When I went to see Avatar over the weekend, we were given different 3d glasses to the ones we’ve had before. They weren’t the usual passive polarized glasses, and they didn’t look like the active glasses you get for home cinema.
The glasses had pretty reflective lenses, and looked more like mirror shades. Also, when the cinema wasn’t showing a 3D movie, the right hand lens went completely opaque
How do they work?
In: 4
They use dichroic filters, which are extremely accurate color filters. They pass along slightly different shades of red, green and blue for each eye, while blocking the very similar but slightly different shades of red, green and blue meant for the other eye.
When showing 2D films, only the “default” shades of red, green and blue are used, which all go into the left eye.
Edit: I found that if I wanted to see the difference, the easiest was to look at a red object in a movie, and alternately closing one eye or the other. The red would be slightly more orange on one side. It’s so subtle that we normally don’t notice it when looking with both eyes.
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