RGB color change principle explained

What’s RGB Light

RGB Lights represent red, blue and green LEDs. RGB LED products combine these three colors to produce light in over 16 million hues. Please note that not all colors are capable of being formed, and some colors are outside the triangular range that can be formed by RGB Lights. In addition, colors like brown or pink are difficult or impossible to form by RGB Lights.

The RGB color model, also known as the RGB color model or the Red, Green and Blue color model, is an additive color model in which the three primary colors of red, green and blue are added in different proportions to synthesize and produce various colors of light.

The main purpose of the RGB color model is to detect, represent and display images in electronic systems, such as TVs and computers, using the brain to force visual physiological blurring (defocusing), synthesizing the three primary color sub-phenomena into one color pixel to produce perceived color (in fact, this true color is not the synthetic color produced by the additive color method. 

Because the three primary colors of light never overlap together, only human beings in order to The reason is that the three primary colors of light never overlap, but the human brain forces the eyes out of focus in order to “want” to see the color. (The situation is actually a bit like looking at those Autostereograms stereograms. 

Where the brain and eyes are distorted to see the stereoscopic image of what they “want” to see). The red, green and blue model is also used in traditional photography. Before the electronic age, the RGB color model had solid theoretical support based on human perception of color.

RGB is a device-dependent color space: different devices detect and reproduce specific RGB values differently because color substances (fluorescents or dyes) and their individual response levels to red, green, and blue vary from manufacturer to manufacturer, and even from time to time for the same device.

RGB color change principle explained

Is through the three base color LEDs are lit when two LEDs, it can emit yellow, purple, cyan (such as red, blue two LEDs when lit purple light); if red, green, blue three LEDs lit at the same time, it will produce white light. If there is a circuit to make red, green, blue LEDs are lit two by two, lit separately and three primary color LEDs lit at the same time, he will be able to send seven different colors of light to, so there is a seven-color LED lights of this phenomenon.

Color-changing lights are composed of red (R), green (G), blue (B) three primary color LEDs. Two-color LEDs are very familiar to us. Generally composed of red LED and green LED. It can emit red light or green light alone. If the red light and green light at the same time when the bright spot, red and green light mixed into orange.

RGB lights

Color is a property of light, without light there is no color. Under the illumination of light, people feel the color of various objects through the eyes, these colors are the combined effect of the characteristics of the human eye and the objective characteristics of the object.

Color television technology is based on the visual properties of the human eye to transmit and receive color images. Under the sunlight, people can see the colorful nature scenes. The optical theory of physics shows that light is a substance in the form of electromagnetic waves.

Any electromagnetic wave that can cause visual response of human eyes is called visible light, which is an electromagnetic wave with wavelength between 380~780nm.

The human eye can not only distinguish the size of the brightness of colored light, but also the color of the light when the intensity of colored light is sufficient. For colored light can be described by three physical quantities: brightness, hue and color saturation. In the color television, the so-called transmission of color images, in essence, is the transmission of the brightness and chromaticity of the image.

Different wavelengths of monochromatic light will cause different color perceptions, but the same color perception can originate from a combination of different spectral components.

People in the color mixing experiments found that: nature appears in a variety of colors, almost all can be mixed with a certain three monochromatic light in different proportions and get. Three monochromatic light with this characteristic is called primary light, these three colors are called three primary colors.

The three primary colors used in color television are red, green and blue. The main reason is that the human eye is most sensitive to these three colors of light, and the red, green and blue mixed together can be matched with more color.

The trichromatic principle is an important principle for decomposition and mixing of color. This principle lays the foundation for color television technology, greatly simplifying the use of electrical signals to transmit the technical problems of color.

According to the three-color principle, we only need to decompose the various colors to be transmitted into red, green, blue three base colors, and then turn them into three electrical signals for transmission.

In the receiving end, with these three kinds of electric signal can send red, green, blue color tube, can re-display the original color image. Now we use the color TV, look close to the screen, you will find that the color image is composed of many red, green and blue three dots. 

This is the use of the human eye spatial details of poor discrimination, the three primary colors of light are projected on the same surface of the red, green and blue phosphor, because the distance between the dots is very small, the human eye will produce three primary colors of light mixed with the color feeling. This is the spatial summation color mixing method.

RGB lights

In secondary school physics class we may have done the prism test, white light through the prism is broken down into a variety of colors gradually transition of the color spectrum, the colors in the order of red, orange, yellow, green, green, blue, purple, which is the visible spectrum. 

The human eye is most sensitive to red, green and blue, the human eye is like a three-color receiver system, most of the colors can be generated by red, green and blue in different proportions of the synthesis. Similarly most of the monochromatic light can also be decomposed into red, green and blue three color light. This is the most basic principle of colorimetry, that is, the principle of three primary colors. 

The three primary colors are independent of each other, any one of the primary colors can not have the other two colors synthesized. Red, green and blue are the three primary colors, these three colors synthesized the widest range of colors. Red, green and blue three base colors in accordance with different proportions of the synthesis of mixed colors called additive color mixing.

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