Principle of printing photography color separation

1. When making a plate, the original should be divided into four colors: blue (C), magenta (M), yellow (Y), and black (K). What is the color separation principle?

A: There are tens of thousands of colors on the screen in color drawings or color photos. It is almost impossible to print all these thousands of colors in a single color. The method used for printing is four-color printing. That is, the original is first color-coded and divided into four color versions of blue (C), magenta (M), yellow (Y), and black (K), and then printed. Synthesis.

The so-called "separation" is based on the principle of subtractive color, the use of red, green, and blue color filters for selective absorption of different wavelengths of color light features, and the original is decomposed into yellow, goods, blue three primary colors. In the color separation process, the color light absorbed by the color filter is the complementary color light of the color filter itself, so that a black and white image negative film is formed on the photographic film, and then the screen is screened again to form a dot negative film, and the copy is finally printed and colored into various colors. Printing plate. This is the earliest photographic separation principle.

Due to the development of printing technology, we can now separate, sample, and convert the color of a manuscript into digital information by using a prepress scanning device. That is, the color of the manuscript is divided into red (R) and green (G) by the same method as photolithography. Blue (B) three colors, and digitization, and then use a computer to mathematically decompose the digital information into blue (C), magenta (M); yellow (Y), black (K) four-color information.