How many colours exists?

Answer 1

Color is a human response to photons of different wavelengths.

A normal human eye has photoreceptors that respond to different bands of wavelengths: rods and cones.

Most of us have three types of cones:
One that responds to light between wavelengths of 350 to 500 nanometres (best reception at 420 nm, what we call blue); another to light with wavelenths roughly between 450 and 600 (peak: 534 nm = green) and the third from 480 nm to 670 nm (peak: 564 nm = red)
Numbers are approximate.

The frequency to which a cone is more sensitive is a direct result of its physical size (there are short, medium and long cones).

The brain analyses the mix of signal strength from each series of cones and interprets a particular mix as a color.

In addition, our eyes have rods which are more sensitive than cones (we can see in fainter light) but do not provide color information (that is why most things are colorless in moonlight).

Answer 2

Basic 3: Red, Green, Blue.
Millions of other colours are combination of these three - with varied percentage of mixing.

Answer 3

Red Yellow Blue Green , Black & White. Rest of the colours are just combinations of these.

Answer 4

For a colorblind person there are no colors. For a person with normal color reception there are only three different types of color receiving cones on the eye's retina and all other colors are due to mixtures of the three different colors. A particular color cone is sensitive to photons of a given narrow range of wavelength which triggers a chemical change in the cone and a nerve impulse to the brain. Interestingly, a color TV set needs only three different electron guns (and three different colored phosphors) to produce all possible colors and shades (including white which is a mixture of all colors and black which is the absence of any color).

Answer 5

you have got a lot of answer .actually their exist only three colours namely red, blue & green . now the 7 colours we see in the light spectrum are fromed due to alternate overlapping of these colours . talkig about IR & UV they are not colours rather they are radiations

Answer 6

An infinite number.

Thank you for spelling that word correctly.

I hate the American dumbed-down version "color".

Human perception is limited, so there is only so much we can distinguish. Some beings can probably see more colours than we can, just as some see less.

Answer 7

Color is not an inherent property of light, but a feature of human perception. The appropriate inherent property of light is its wavelength.

As far as human perception is concerned, there are three colors, because humans have three different kinds of color receptors, red, green, and blue.

All other colors are combinations of the three primary colors.

Answer 8

It depends, If you're talking about paints then probably in the thousands, However, if you're thinking about RGB, CMYK up until electrons and frequencies all the way up to ultaviolet and infared and all that jazz where the spectrum ends. Then, millions and millions...

and millions.

Answer 9

There is an infinite number of possible colours.

Answer 10

there are infinte,because you can just increase the shade by a little bit every time but you will only find the most used colors in crayon boxes