Page 180 - Coincidences in the Bible and in Biblical Hebrew

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CHAPTER 12 THE COLORS
CHAPTER 12 THE COLORS 159
All colors in Table 12.1 are visible colors. Therefore, only an approximate
interval can be given for each color. Later, we will take midvalues of these intervals
as representative values in order to conduct some statistical calculations, which
store coincidences.
How does the human eye perceive color?
As a sensation experienced by humans and some animals, color perception is
a complex neurophysiological process. In the human eye, there are three types
of neuroreceptors, each sensitive to only one spectral color: red, green, or blue

(RGB ). All colors perceived by the human eye are built by a mixture of these
three basic colors, and the same color sensation can be produced by different
physical stimuli. To be precise, each type of light-sensitive cell, or “color recep-
tor,” is in fact sensing a band of colors—one band centered in the wavelength
interval recognized as red, one in the green interval, and one in the blue interval.
Any color that we see—including brown, olive green, and others absent in the
rainbow—is an impression our brain produces when it combines signals from
these three color bands. Thus, a mixture of red and green light of the proper
intensities appears exactly the same as spectral yellow, although it does not contain
light of the wavelengths corresponding to yellow.

Comments
This comment delivers some further details about the physiology of the color
vision of the human eye. The comment is largely based on a description of the
human vision taken from Wikipedia , the free encyclopedia, at
http://en.wikipedia.org/wiki/Color_vision.

The retina of the human eye contains three different types of color receptor
cells, or cones. One type, relatively distinct from the other two, is most responsive to
light that we perceive as violet, with wavelengths around 420 nm (nm is nanometer
and was defined earlier). Cones of this type are sometimes called short-wavelength

Table 12.1. Seven elementary colors in the human visible spectrum.

Primary color Wavelength interval Frequency interval
red ~ 625–740 nm ~ 480–405 THz
orange ~ 590–625 nm ~ 510–480 THz
yellow ~ 565–590 nm ~ 530–510 THz
green ~ 500–565 nm ~ 600–530 THz
cyan ~ 485–500 nm ~ 620–600 THz
blue ~ 440–485 nm ~ 680–620 THz
violet ~ 380–440 nm ~ 790–680 THz