CMYK is also called the printing color mode, as the name implies, it is used for printing. Compared with RGB, there is a big difference: RGB mode is a luminous color mode, you can still see the content on the screen in a dark room; CMYK is a color mode that relies on reflections. How do we read the content of newspapers? It is the sunlight or light that shines on the newspaper and then reflects it in our eyes to see the content. It needs an external light source, if you are in a dark room you cannot read the newspaper. As mentioned earlier, as long as the image displayed on the screen is represented by the RGB mode. Now add a sentence: As long as the image seen on the printed matter, it is expressed in CMYK mode. For example, periodicals, magazines, newspapers, posters, etc. are all printed, so it is in CMYK mode. Similar to RGB, CMY is the initial letter of the names of three printing inks: Cyan, Magenta, and Yellow. And K takes the last letter of black. The reason why the first letter is not taken is to avoid confusion with blue. Theoretically speaking, only three CMY inks are enough, and the three of them should be added together to get black. However, since the current manufacturing process cannot produce high-purity inks, the result of CMY addition is actually a dark red color. Therefore, it is necessary to add a special black ink to neutralize.
