How much information does it take us to recognize the difference? Well, for the human eye, the human perception of size is very small.
This is the most obvious visual effect – human eyes can distinguish between a 5ft (1.4m) tall man-like creature and a 3ft (90 cm) tall humanoid, and a 6ft (2.5m) tall human and a 2ft (61 cm) tall ape are indistinguishable from each other in the same light.
So why is our perception of size so much smaller than it used to be?
Scientists suggest it’s because our brains have evolved to accept much brighter light than we are used to and our vision has developed from our first sight of color.
In the 18th and 19th centuries, the dominant light used for illumination in Europe was white phosphorous (PP), which emitted a light spectrum with a blue-white color. The new “photopic” light spectrum is blue-green, blue-violet, green, yellow, and so on.
As humans evolved, their eyes changed to absorb this new “photopic” light more effectively (because their retina wasn’t so big). When the eyes developed, they looked to see blue, as well as green and yellow as color, without the presence of white phosphorous to block their eyes from light.
The result is that our eyes have a “visual center of the retina”, which consists of a bunch of cone cells, where the light rays are reflected back from the retina to form the visual image. This center is called the fovea, and it is one reason why we can see colors so readily. A color that is reflected back is perceived as a different color than it was in the first place.
A few hundred billion years later, Europeans discovered that they could use the newly developed photopic spectrum to create blue and green “color” vision – because when the original blue eye color was used, blue-green color perception, combined with the ability of the eye to absorb the new photopic light spectrum, created blue-green color perception.
So how do we now perceive the actual amount of light it takes to perceive light?
This is the problem now.
The human visual system is not designed to process the different amounts of light that are available in a single scene. For example, the human visual system processes images of dark black and white (the human eye cannot process colors). So the number of light intensity we
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