How human eye detect colors since it only able to detect RGB then how do they see or detect white 'color'?

The human eye is able to detect more frequencies of light than just red, green, and blue. However, the three types of retinal cone cells each have *peak* sensitivities at the frequencies corresponding to red, green, and blue. The sensation of 'white' is simply all three types of retinal cone cells being stimulated at once. This can be accomplished in many ways, including: 1) Hitting the retina with three individual frequencies of light, corresponding to red, green, and blue 2) Hitting the retina with a broad spectrum of light, corresponding to a color temperature of 5800 Kelvin (the temperature of the surface of the Sun). A CRT television uses method 1) by illuminating red, green, and blue pixels. If you look at a piece of white paper in sunlight, you are using method 2).

RGB is present day technology. The eye sees other colours too as below. RyoGBiv. It is popularly written as VIBGYOR standing for Violet, Indigo, Blue, Green, Yellow, Orange & Red and are the natural (pure) colours. They differ only in wavelength from 0.375 micron to 0.7 micron(a micron is a million-th of a metre) of the Electromagnetic spectrum. Or alternatively these are in frequencies of 800 THz or Tera Hertz (Tera is million millions) down to 428 THz. There are structures called cylinders & cones in the Retina (of the eye) of which cones determine the colour seen. Optic nerve takes the electrical impulses actuating the brain to interpret. Others that we call colours are combinations. When all colours are present equally that gives a sensation of seeing 'White'. Just as white light means presence of all colours, 'Black' is the absene of all colours. Colours like brown & pink are entirely artificial in that these are sensations created in human sight process. For the technological ease of depicting all colours the three colours R, G, B were adapted for TV picture. By proportionately combining them, other colours are achieved. Now the computer does the job creating tens of thousands of hues, tints, tinges & shades.

All the colors we perceive are created in the brain. When the red, green, and blue receptors in the eye are equally stimulated and putting out equal signals, the brain sees this as "white". This is true no matter what the details of the spectrum are.

Color is a feature of our eyes' perception of light. Light consists of photons; and every photon has a particular wavelength. Likewise, we have three types of "cone" receptors in our eyes (called "L", "M" and "S"), which respond differently to different wavelengths. For example, if you shoot a bunch of photons of wavelength 6250 at your eyes, this will stimulate the "L" cones a lot, but the "M" and "S" cones hardly at all. Our brains interpret this pattern of stimulus as "red". And if you shoot photons of wavelength 5580, they'll stimulate both the "L" and "M" cones a lot, but not the "S" cones. We interpret this stimulus as "yellow." In most cases--even if we're looking at something that we perceive as "all one color"--what we're really getting is a mix of photons of many different wavelengths. Depending on their intensities and their wavelengths, those photons will collectively stimulate the "L", "M" and "S" cones to different degrees. And the color we perceive depends on that pattern of stimulation. If all three cone types are being stimulated in roughly equal amounts, we interpret the color as "grey" or "white" (depending on intensity). In "natural" light, white usually happens when there are many photons over the full range of visible wavelengths. But white can also be "simulated" by using just three well-chosen wavelengths, each of which is designed to stimulate one of the three cone types.

White color IS white light. Let's say you have an insect that is white. The pigments in the epidermis, or the structure of parts of the Integument cause certain parts of white light to reach your eye. When an insect is white, that means that All wavelengths of the light reaches your eye.

1. ALL the color you see is light. In the case of most objects, reflected light, but still light. 2. You can mix "RGB' artists colors or light from TV pixels to produce other colors right? 'White' is a mix of all those wavelengths.

We don't see in RGB. We see the whole array of visible colors. White color on a surface reflects back the whole visible spectrum. With the colors combined, it appears white. Likewise with a complete electromagnetic source (star).