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March 02, 2005
red/cyan/left/right/black/white
Here are some images that will hopefully clear up the confusion about which eye sees which color. Or maybe they'll just confuse you more. Whatever.
The left eye sees the image through a red filter. Therefore, in the white half, the cyan image turns black, and the red image turns white (matching the background), and the opposite happens through the blue filter (red turns black, cyan turns white). So in the white half, Left/Red sees Cyan, and Right/Blue sees Red.
However, in the black half of the image, looking through the red filter, the cyan image turns black (matching the background), and the red image turns white. So in the black half, Left/Red sees Red, and Right/Blue sees Cyan.
White Background: Left/Red: Cyan, Right/Blue: Red
Black Background: Left/Red: Red, Right/Blue: Cyan
This also means that if something cyan is to the left of something red, it means either a) it's seen against something lighter and it's behind the screen (uncrossed parallax), or b) it's seen against something darker and it's in front of the screen (crossed parallax).
Here's another demonstration:
Notice that red and cyan are left and right are reversed in the two images, but looking through red/blue glasses, both images present the same spatial information.
The upshot of all this is that trying to figure out which image is which based on color relationships can tie your brain in knots.
Posted by Perry at March 2, 2005 03:29 PM
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