Color Disparity Image matrix for Walker Canyon Aspen 

The Crosseye pair is the top pair.  The right image is on the left view it crosseyed.
The second row shows the right image as a negative (inverted)
at 50% opaque and 100%.

 
 
right image
left image
50% invert
of right
invert
of right
right + 50%  right  invert
50% right invert + left image

This is a crosseye pair with the right image on the left

 
 
The gray field is what we get when we subtract the image from itself (summation with the invert).  It could also be considered the summation with the opposite color and opposite intensity. Now we compare the image with the other half of the stereo pair and find that the field is no longer uniformly gray.  The close grasses show the largest zones of black & white.  The aspens show their edges.  The distant mountains would be less visible if the camera's lenses were better matched.

 

Why would we care?  If take stereo photos we will  recognize verticle edges with contrast as cues for visual framing.  We may choose sparse cues or exercise other choice but, we would recognize contrast and color contrast as depth tools.  If we were interested in robotics, mapping, software, data processing or biology we may like this topic. 

Nature builds its remarkable machines with dedicated hardware and fused senses.  Human vision isn't designed to see images so much as it is to see objects.  Depth perception is part of our reality and it provides us with necessary information.

 
 

complementary contrasting colors
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