Printing color is composed of different percentages of C, M, Y and K, so it is more reasonable to call it mixed color. C, M, Y and K are four primary colors commonly used in printing. When printing primary colors, these four colors have their own swatches, and the dots of this color are recorded on the swatches and generated by halftone screens. When four swatches are combined, the defined primary colors are formed. Other primary colors can be formed by adjusting the size and spacing of points on the color palette. In fact, the four printed colors on the paper are separated, but they are very close. Because of the limited resolution of the eyes, we can't tell them apart. The visual impression we get is the mixed effect of various colors, so different primary colors are produced.

Y, M, C can synthesize almost all colors, but it needs black, because the black produced by Y, M, C is impure, and it needs purer black when printing. If Y, M, C is used to produce black, there will be too much local ink.

c、M、Y、K:

Represents the four colors used in printing.

C stands for cyan, M stands for magenta (also called magenta), Y stands for yellow, and K stands for black.

Because in practical reference, it is difficult for cyan, magenta and yellow to form real black, and at most it is brown. So k black was introduced.

The role of black is to strengthen the dark tone and deepen the dark color.

For printed materials mainly written in characters and black, cyan, magenta, yellow and black are usually used in the printing color sequence. However, if there is black text or a field of yellow overprint, yellow should be put in the last color.

General printing color sequence is to print dark ink first and then light color, such as printing four-color ink CMYK, the first K, the second C, the third M and the fourth Y. ..