tetrachromatography

yah see now,
when you hear a violin note,
it can have a low pitch,
a little higher, a little higher,

now depending on how sensitive you're ears are,
you can put two notes side by side, and say,
well,
"I can tell that one note is a little lower than the other"

There may come a point that you cannot tell the difference,
depending on you're ears.

let us say,
you could split the tones up to a hundred (100) different tones.

Then on top of that,
lets say you could tell who had more volume.
 louder,vs softer,
listening to two different sounds.

So a hundred different leveles of loudness,
let us say you could discern
and a hundred different pitches of higher or lower ,
and you multiply that together,and that means your ear can tell apart 100x100= 10,000 (Ten thousand )
different single tone sounds.

Now most of what we here is made dup of a number of mixed tones,
low tones,
medium tones,
and hi tones.  

And the weigh our eres work is with these little hairs standing up like pine trees, and they vibrate from the different tones,
kined of like a wine glass,
you can sing at it,
and if it is the rite note,
it will start to vibrate,
and a opera singer can make it shatter,
it gets vibrating so much.  
So your ear has many different hairs,
each getting shaking for a different pitch.

Well,
the hairs really will get to vibrating for anything NEAR a certain pitch,
if you sing a little off tune,
well,
that particular hair,
say for the C note,
will still shake,
but some near by,
will also start to shake as well.
shake my sugar tree

Now when we move these idears to light and color,
well we can have a pure frequency of light
and it will be like a pure sound tone,
but the eye does not have the many hairs that the ear has,
rather,
it has just three sensors,
called cones,
and they respond to a fairly broad
color frequency range,
one in the range we sense as red,
the next  green,
the next blue.  

Also,
a single frequency of lite will 'shake' or stimulate all three sensors,
but usually it will do one more than the other two.  

this sends a certain number of electrical pulses per second to your brain via a nerve fibre.  

Lets say the R,G,B sensors pulse at 25,2,12.  

Well your brain will sense that as a certain 'color'.  

Now since your eye boils down what it is looking at into three pulse trains,
you can 'fake' it by using three separate lights,
a red one,
a green one,
and a blue one.  

by adjusting their brightness,
you can get your eye sensors to make that same "25,2,12" combination,
to get sent to your brain,
and your brain don't know nothing is any different.

For exemplo,

Take a rainbow.  You don't need to take the lepperochan or the pot of gold,
just look at the rainbow.  focus on just one color band.
It is a pure tone of light, one frequency.  Your eye senses it with a certain combo of the RGB sensor.

When you take a picture of it with your digital camera, and display it on an LED screen,   that pure tone color is actually recreated with three separate color tones or frequencies, from a red led(Light emmiting diode), a green lite, and a blue lite, at that particular spot on the screen.  If you put your cell phone under a strong magnifying glass, you will actually see the three separate, but tiny lights.

So that is how your color TV works,
it has three lights,
and turns on each to differnent brightness levels,
to simulate an actual 'color'

So the eye may not be as good as the ear in interpreting colors,
but the eye does something more better than the ear,
and that is it has a whole lot of sensors,
to make an overall image.    

It is really a whole miraculous lot of data pouring into your brain from the eyes all at once,
to make what we see.  

The ears have an easier time of it,
they hear the sound,
but it is just one sound,
we are not making a map of the sounds coming from many different places simultaneously.  

Well,
with two ears,
and the 'stereo' effect,
we can also kind of put a 'location' to each sound.

So,
what is all this talk about a million different coluors?  

Well lets say our eye can tell the difference between an RGB signal of (25,50,75), and (24,50,75) so if you put those two colours next to each other, your eye could say they look different.

Likewise, (25,50,75) and (24,50,75) would look different than (25,50,76)

So with three sensors, assuming you can sense a difference of 1%, or a hundred different levels for each sensor,
that would make 100x100x100=1,000,000  different sensations that could be sensed as different.

Now if you are a bird, you got four different light sensors, each one for a general range of light frequencies.  Assuming the bird also has 1% sensitivities,  
100x100x100x100= 100,000,000 different colours, which is 99 million more than us peoples.

Now as with genetic abnormalities,
such as people born with six toes,  
some women are born with an extra set of light sensor cones in their eyes,
they got a set of 4,
so they can sense colours,
like a bird,
able to see 100 million different variations of color.

Well now just a final note,
the woman with the four cones also has to have
a fourth data nerve line to keep the fourth cone signals to arrive into
the brain as a fourth signal.
Sometimes the poor girl has got the extra cones, but
the signal is just added into the other three lines,
so she don't
get the prize.

Now guys, well guys
they get another genetic twist,
coleur blindess, where they just get one signal per vision pixel,
so they can tell the difference in overall brightness, like the difference between
(45) units of light compared to (44).

but like dogs and cats that are mostly interested in hunting,
who really gives a hoot and a holler if it is a black and white movie or
the wizard of Oz? I mean the puss is just out hunting a mate
he doesn't always care what color she is. right?