The four-color printing mode is a color registration mode used in color printing. Using the three primary color mixing principle of color materials and black ink, a total of four colors are mixed and superimposed to form the so-called "full-color printing". The four standard colors are: C: cyan = cyan, also known as sky blue or azure blue; M: Magenta = magenta, also known as magenta; Y: Yellow = yellow; K: Black = black. CMYK mode is subtractive mode, while RGB mode is additive mode.

So what is CMYK?

CMYK is also called printing color mode, which is used for printing.

The difference between RGB and RGB is that RGB mode is a color mode in which the screen displays light. You can still see the content on the screen in a dark room; CMYK is a kind of color mode for printed matter that depends on reflection.

How do we read the contents of newspapers? It is the sunlight or light that shines on the newspaper and then reflects it into our eyes to see the content.