What is printing color?

A: the printing color is the color of the percentages of different C, M, Y and K, so it is more reasonable to call it mixed color. C, M, Y and K are the four primary colors commonly used. When the printing color, these four kinds of color has its own version of color, recorded the outlets of this kind of color on the color version, these outlets are generated by halftone screen, the four color version together are formed, as defined by the primary colors. Adjust the size and spacing of the dot on the color plate to form other primary colors. In fact, the four printing colors on the paper are separated, but they are very close, so we can't distinguish them due to the limited ability of our eyes. The visual impression we get is the mixed effect of various colors, resulting in a variety of primary colors.

Y, M, C can almost all colors, but also need to black, because black is produced by Y, M, C is not pure, at the time of printing needs more pure black, and if use Y, M, C to produce black local ink too many problems.