Light and color

Monochromatic light has two characteristics: frequency and intensity.

In a beam of sunlight, monochromatic light with multiple frequencies, the frequency and intensity of these lights are listed on the spectrum map, and the spectrum of the beam is obtained.

The monochromatic light of different frequencies can make the human eye feel different color, and its intensity corresponds to the brightness of monochromatic lights.

There are cells in the human eye that can receive and feel light, often the same frequency of light, the intensity of which is different, in the eyes of the human eye, it will make the color and brightness changes. It's amazing.

The intensity of monochromatic light also affects the color of a person's perception of a wavelength, such as the dark Orange is felt brown, and the dark yellow green is felt as olive, and so on.

Below is the visible spectrum:

Visible light is made up of a few monochromatic colors, which have different frequencies.

In printing or drawing we generally use pigments that reflect a certain wavelength. When white light shines on these pigments, they reflect only a certain amount of light and produce a color effect.

Glowing media, such as televisions, use three colors, red, green, and blue, and each light stimulates as much as possible the cone-like cells that target them without stimulating other cone-shaped cells. The color gamut of the system accounts for most of the color space that people can feel, so televisions and computer screens use this system.

In theory we can also use other colors as meta-colors, but using red, green, and blue we can reach the human color space to the maximum.

People tend to use a different color system when making computer images. This color system uses three coefficients called hue, saturation, and lightness, respectively.

hue determines which color is used, the degree of saturation determines the purity of the color, the brightness determines the degree of light and shade.

Structure Color

If the structure of an object's surface allows it to have a gap between the absorption of light and the reflective part, and these different optical characteristics of the distance between the wavelength of the light, then the white lights on the surface when the diffraction will occur, a certain color of light will be reflected to a certain angle. The surface of this object produces a special rainbow-like glow. The feathers of the peacock, the wings of the butterflies, the shell of the shell and so on will produce such structural colors. Recently, some automakers have also used special paints to achieve this fluorescent effect.

Resources:

Https://zh.wikipedia.org/wiki/%E9%A2%9C%E8%89%B2

Light and color