Why is it impossible to create a fourth primary colour?
Answer:
Primary colors are not a fundamental property of light but rather a biological concept, based on the physiological response of the eye to light. Fundamentally, light is a continuous spectrum of wavelengths, an infinite-dimensional stimulus space. However, the human eye normally contains only three types of color receptors called cone cells. Each color receptor responds to different ranges of the color spectrum. Humans and other species with three such types of color receptors are known as trichromats. These species respond to the light stimulus via a three-dimensional sensation, which can generally be modeled as a mixture of three primary colors.
Species with different numbers of receptor cell types would have color vision requiring a different number of primaries. For example, for species known as tetrachromats, with four different color receptors, one would use four primary colors. Since humans can only see to 400 nanometers (violet), but tetrachromats can see into the ultraviolet to about 300 nanometers, this fourth primary color might be located in the shorter-wavelength range.
Many birds and marsupials are tetrachromats, and it has been suggested that some human females are tetrachromats as well, having an extra variant version of the long-wave (L) cone type. The peak response of human color receptors varies, even amongst individuals with 'normal' color vision; in non-human species this polymorphic variation is even greater, and it may well be adaptive. Most mammals other than primates have only two types of color receptors and are therefore dichromats; to them, there are only two primary colors.
It would be incorrect to assume that the world 'looks tinted' to an animal (or human) with anything other than the human standard of three color receptors. To an animal (or human) born that way, the world would look normal to it, but the animal's ability to detect and discriminate colors would be different from that of a human with normal color vision.
Oh yeah, neither Balck nor White are technically colors:
White = the PRESENCE of ALL colors
Black = the ABSENCE of All colors
Because all secondary colours can already be created by using the three current primary colours.
Because all colours are mixed from the three primary colours and are therefore secondary.
The definition of a primary colour is that it is one of a set of three colours which can be mixed to produce any other colour. It is possible to create a different set of primary colours, but you can't create a fourth because then by definition the other three wouldn't have been primary colours in the first place.
Why would u sit there on a friday afternoon wondering such a weird question! that's my thoughts, but yes everybody else is right! ;o)
I'd have taken that as red (dya gettit?)
isnt the primary colours red, green & yellow? what about white these cant make white can they?
why not make white the fourth colour
The primary colours are actually RED, BLUE and YELLOW.
They are the primaries because they do not contain any elements of the other colours (all other colours contain elements red, blue or yellow).
Technically, white is the *absence* of colour so cannot be classed a colour, and black is meant to be all the colours combined.
(except when talking about light, then it is reversed - white light is the mixture and black is the absence).
This is set in nature, so you'll have to ask whoever devised Nature why there are only 3 primaries :o)
Red, blue and yellow are the primary colours when dealing with paints but red blue and green are the primarys colour of light.
So i suppose it's not impossible.
In all media there are 4.
You don't actually create colours. What you are doing is assinging names to a length on a wave with several properties. And you are actually blocking them. Now I have made sound complicated. You might consider that visible light is only a very small part of the waves available. Suppose the cone receptors in our eyes received a different part of the spectrum. Then the physics would be different and you could have different names for different mixes. Make up whatever names you thought you liked.
If you can have fun asking, I can have fun speculating in the answer.
You can't in our visible spectrum.
It is all due to our limitations.
Strictly speaking there ARE 4 primary colours..
Red,Blue, Green, Yellow,
Red , Blue and Green are primary colours in light.
Red, Blue ,Yellow are primary colours in paint.
In light Red + green = yellow
In paint..Blue + yellow = green.
So yellow and green can be primary and secondary colours.
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