How many colours can see a Tetrachromat in a Rainbow ???...

[Koni]

How many colours can see a Tetrachromat in a Rainbow  ???...

( millions of colors !!!.... is NOT an assesable answer !!!... )

 

Humans with three(3) /cones\ !!!...

can see in the rainbow seven(7) colors !!!...

 

Humans with two(2) /cones\ !!!...

can see in the rainbow three(3) colors !!!... ( BLUE-WHITE-YELLOW) !!!...

 

Humans with "only" one(1) /cone\ !!!...

can see in the rainbow "only" WHITE !!!...

 

 

[Sensei]

A 24-bit/32-bit computer screen is capable of displaying 16777216 colors. 2^8 = 256. 256^3 = 16777216.

 

1) Download some 2D paint program or use an online editor.
2) Draw a figure with a color of, say, 255,0,0 and another figure with a color of 254,0,0.
3) I can immediately see where the transition is between them.
If you are not able to, your eyes are damaged and you need to go to an ophthalmologist.

 

Edited Wednesday at 07:47 PM by Sensei

[Ken Fabian]

When I look at a rainbow I see a progression of colours between inside and outside edges, not distinct bands of seven separate, distinct colours. Naming them red, orange, yellow, green etc is convenient and give an idea of where on the spectrum but even I routinely give names to more than seven. Teal for example - and that word is still for a range of colours, not one unique colour. Any trained artist - or paint supplier - will have a whole lot more colour names than seven - they can get quite creative with the names.

[Sensei]

4 minutes ago, Ken Fabian said:

When I look at a rainbow I see a progression of colours between inside and outside edges, not distinct bands of seven separate, distinct colours. Naming them red, orange, yellow, green etc is convenient and give an idea of where on the spectrum but even I routinely give names to more than seven. Teal for example - and that word is still for a range of colours, not one unique colour. Any trained artist - or paint supplier - will have a whole lot more colour names than seven - they can get quite creative with the names.

The problem with physics and biology is that the human eye is imperfect. Do you see the yellow color on your computer screen? It's just green and red LEDs. It is not a true yellow photon. A similar example is violet, which is a mixture of red and blue LEDs. It is easy to fool the human brain. You can create a grid with two different colors, and the brain will interpret them as a different color (which is not actually there).

[Ken Fabian]

Yes, and the receptors in retinas are like that too, even before the visual cortex gets involved - or other brain processes fill in details expected to be there, predicted to be there, not necessarily out of what the optic nerve transmitted. Kinda remarkable such biological systems work so similarly between individuals and can deliver such high levels of discrimination.