RGB color mode on the monitor

- Aug 28, 2020-

Most of the current displays adopt the RGB color standard,


On the display, colors are produced by hitting the red, green, and blue light-emitting poles of the screen with an electron gun. Current computers can generally display 32-bit colors, with more than 10 million colors.


All the colors on the computer screen are composed of the red, green and blue colors mixed in different proportions. A group of red, green and blue is the smallest display unit. Any color on the screen can be recorded and expressed by a set of RGB values.


Therefore, the red, green and blue are also called the three primary colors, which are R (red), G (green), and B (blue) in English.


In computers, the so-called "how much" of RGB refers to brightness, and it is represented by integers. Normally, RGB has 256 levels of brightness, which are represented by numbers from 0, 1, 2... until 255. Note that although the highest number is 255, 0 is also one of the numbers, so there are 256 levels in total. It is like 11 years from 2000 to 2010.


According to calculations, 256-level RGB colors can combine a total of about 16.78 million colors, that is, 256×256×256=16777216. Often referred to as 16 million colors or tens of millions of colors. Also called 24-bit color (2 to the 24th power).


In the LED field, three-in-one dot-array full-color technology is used, that is, full-color pixels are composed of RGB three-color chips in a light-emitting unit. As this technology continues to mature, LED display technology will bring people a richer and more true color experience.


RGB is designed based on the principle of color luminescence. Popularly speaking, its color mixing method is like three lights of red, green and blue. When their lights overlap each other, the colors are mixed, but the brightness is equal to The sum of the three brightness, the more mixed the higher the brightness, that is, additive mixing.


The superposition of the red, green, and blue lights, the brightest superposition area of the three colors in the center is white, and the characteristic of additive mixing: the more superimposed, the brighter.


Each of the three color channels of red, green and blue is divided into 256 levels of brightness. At 0, the "light" is the weakest-it is off, and at 255, the "light" is the brightest. When the three-color grayscale values are the same, gray tones with different grayscale values are produced, that is, when the three-color grayscale is 0, it is the darkest black tone; when the three-color grayscale is 255, it is the brightest white tone .


RGB colors are called additive colors because you can produce white by adding R, G, and B together (that is, all light is reflected back to the eye). Additive colors are used for illuminating lights, televisions, and computer monitors. For example, displays produce colors by emitting light from red, green, and blue phosphors. Most of the visible spectrum can be expressed as a mixture of red, green, and blue (RGB) light in different proportions and intensities. If these colors overlap, cyan, magenta, and yellow are produced.


RGB format


The method of encoding a color is collectively referred to as "color space" or "color gamut". In the simplest terms, the "color space" of any color in the world can be defined as a fixed number or variable. RGB (red, green, blue) is just one of many color spaces. Using this coding method, each color can be represented by three variables-the intensity of red, green and blue. When recording and displaying color images, RGB is the most common solution. However, it lacks good compatibility with early black and white display systems. Therefore, a common practice adopted by many electronic and electrical manufacturers is to convert RGB to YUV color space to maintain compatibility, and then switch back to RGB format as needed to display color graphics on computer monitors.