Difference: 1. CMYK is composed of four colors, Cyan, Magenta, and Yellow; RGB is composed of three primary colors of light, red, green, and blue. 2. CMYK is a color mode that relies on reflection, and can only be seen with an external light source; RGB is a luminous color mode, and the content on the screen can still be seen in a dark room. 3. The image displayed on the screen is expressed in RGB mode; the image seen on the printed matter is expressed in CMYK mode.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
When you create a new canvas, you will encounter a "color mode" option. Generally, the default is RGB, but sometimes other modes are also used, such as CMYK. What do these two color modes mean? What's the difference? Simply put, RGB colors are the colors displayed on electronic monitors, while CMYK are the colors used for printing.
RGB (Red, Green, Blue), the three colors of red, green and blue light are not decomposed after being refracted by the prism, and are called the three primary colors of light. After superposition and mixing, various colors can be obtained. The numerical range of the three colors of light is 0-255, and 255 different brightness values. The combination is 2^24 brightness values. When the red, green, and blue values are all 255, white light is superimposed.
CMYK (Cyan=cyan, Magenta=magenta, Yellow=yellow, Black=black) is the color mode used in printing, using the three primary colors of color materials to mix Principle, plus black ink, a total of four colors are used for full-color printing. The value range is 1-100. When CMYK is both 0, it is white, and when both are 100, black is formed. Since the black produced after CMY superposition is not deep enough, black K is added independently.
The difference between cmyk and rgb
1. The primary color composition is different
CMYK consists of four colors Composition, Cyan, Magenta, and Yellow. K is the last letter of black, so K is used to avoid confusion with blue.
RGB is composed of three primary colors of light, R (red), G (green), and B (blue).
2. Different color modes
CMYK is also called printing color mode. It is a color mode that relies on reflection. It requires It can only be seen when there is an external light source. The image seen on the printed matter is represented by the CMYK mode. For example, journals, magazines, newspapers, brochures, etc. all use CMYK mode.
RGB mode is a luminous color mode, you can still see the content on the screen in a dark room.
3. Different imaging effects
The image displayed on the screen is expressed in RGB mode.
The image seen on the printed matter is expressed in CMYK mode.
Extended information:
The actual result of CMY addition is dark gray, which is not enough To express the darkest part of the picture, black must be added. Moreover, black can make the details in the dark parts clearer, making the midtones and dark parts clearer.
A traditional four-color printing machine has four printing rollers, which are responsible for printing cyan, magenta, yellow and black. After a piece of white paper enters the printing press, it must be printed with four kinds of inks to obtain the final printed product.
Each color of red, green, and blue has 256 levels of brightness, expressed numerically from 0, 1, 2... to 255. The 256 levels of RGB colors can create a total of about 16.78 million combinations color.
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