1. RGB refers to the three primary colors of light: R is red (Red), G is green (Green), and B is blue (Blue).
2. The value of RGB refers to its brightness, which is represented by integers from 0, 1, 2, ... up to 255. Among them, 255 is the brightest, and 0 is one of the values, indicating that the brightness is 0. Therefore, R, G, and B each have 256 levels of brightness.
Color RGB value representationIt is concluded from the physical optics test that the red, green and blue colors are not mixed by other colors. The mixing of these three shades of light in almost different proportions gives almost all the colors of nature.
For example, red light and different proportions of green light can be mixed to obtain orange, yellow, yellow and green colors; red light and different proportions of blue-violet light can be mixed to obtain magenta, red purple, purple red blue; purple light and different proportions of green light mixed Can be green, blue, green and blue. If the blue, green, and red lights are mixed in different proportions, more colors can be obtained, and all colors can be obtained by additive color mixing. Since the additive color mixing is a mixture of color light, the brightness of the color light is gradually strengthened as the mixing amount of the different color lights is increased, so it is also called adding light mixing. When full-color light is mixed, it tends to white light, which is brighter than any color.
The value of a color is generally represented by the RGB value of this color. The RGB value refers to the red (Red), green (Green), and blue (Blue) components in a certain color. In theory, the three primary colors of red, green, and blue can be blended in different proportions to match any color.
For example, we adjust an orange color, the following picture is the display in the Photoshop color panel.
The decimal color value of this color is R=239; G=125; B=49, converted to hexadecimal as R=EF; G=7D; B=31.
C language is written as "RGB (239, 125, 49)", can also be written in hexadecimal form "0xEF7D31", written as "#EF7D31" in the HTML code of the web page.
The range of RGB components in the color range is (0~255), which is expressed in hexadecimal (0x00~0xFF). This range takes up exactly one byte (8 bits). Therefore, one color contains three components of RGB occupying three bytes (24 bits), which is the origin of 24-bit true color.
How to judge what color is this based on RGB values?The following describes the RGB values ​​of several typical colors in the format: color (R, G, B). Imagine three red, green, and blue spotlights that shoot three lights.
The three beams of light produce white when they are superimposed. If the brightness of the three lamps is halved, gray is produced. If the three lamps are turned off, they will be dark.
White (255, 255, 255) gray (127, 127, 127) black (0, 0, 0)
Turn off the green and blue lights, only the red light, then only a red color; only the green or blue light will only see green or blue.
Red (255,0,0) green (0,255,0) blue (0,0,255)
Turn off one of the lights and superimpose the light from the other two lights, then blue + green = blue, red + blue = magenta, red + green = yellow.
Cyan (0,255,255) magenta (255,0,255) yellow (255,255,0)
Other colors can be judged based on the RGB ratio of these colors.
Orange (255,127,0) Purple (127,0,255) Pink Green (0,225,128) Lake Blue (0,128,255) Grass Green (128,255,0) Rose Red (255,0,128 )
The closer the RGB value of a certain color is, the closer the color is to gray or black and white. The larger the value, the whiter it is, and the darker it is. For example, RGB (150, 152, 183), the RGB values ​​are relatively close, but the blue components are more, so we can judge that this is a blue-gray.
If one of the RGB values ​​of a certain color differs greatly from the other two values, and the other two values ​​are relatively close, then according to the larger value of RGB, the color is relatively close to red, green, blue, magenta, and blue. One of the yellow ones. For example, RGB (150, 20, 156), R and B values ​​are relatively close, G is small, so this is a kind of deep purple; and RGB (150, 200, 156), R and B are relatively close, G The value is larger, so this is a light green.
This method of judging is actually a way for our brain to convert RGB into HSB by intuition. Therefore, in actual color grading, we generally use HSB instead of RGB, but the method of RGB value representing color is very common in computers. So still need to understand.
Common RGB color table (1)
Common RGB color table (2)
How to use Ps to view the RGB value of a picture, how do we know the RGB value of a picture? After knowing the value of RGB of the picture, it is very important to us. Then how do we check his value? In fact, it is very simple. Let me operate.
1, first open the PS main program of our computer desktop
2, the introduction of the eye is the main program, execute the file in the upper left corner --- open command
3, then our material file is opened by us
4, click on the window to find the color of the next option, the shortcut is F8
5. Click on the suction tool on the left.
6, we arbitrarily suck a place, the foreground color will become the color we sucked
7, you can see the RGB value on the color board
Power 12W ,output voltage 3-12V, output current Max 1A, 6 dc tips. We can meet your specific requirement of the products, like label design. The material of this product is PC+ABS. All condition of our product is 100% brand new.
Our products built with input/output overvoltage protection, input/output overcurrent protection, over temperature protection, over power protection and short circuit protection. You can send more details of this product, so that we can offer best service to you!
12W Wall Adapter, 12W Wall Power Supply,12W Power Cord In Wall, 12W Wall Power Adapter
Shenzhen Waweis Technology Co., Ltd. , https://www.waweis.com