When making a plate, the original should be divided into cyan (C), magenta (M), yellow (Y), and black (K). What is the principle of color separation?
Answer: There are tens of thousands of colors on a color artwork or color photo. It is almost impossible to print these tens of thousands of colors one by one. The printing method is four-color printing. That is, the color of the original is decomposed into four color plates of cyan (C), magenta (M), yellow (Y), and black (K), and then the colors are combined during printing. The so-called "color separation" is based on the principle of the subtractive color method, using the red, green, and blue color filters to selectively absorb the color light of different wavelengths, and the original is decomposed into three primary colors of yellow, magenta, and cyan. 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 negative film of black and white images is formed on the photosensitive film, and then screened to form a dot negative film, and finally copied and dried into various colors Printing plate. This is the earliest principle of photographic color separation.
Due to the development of printing technology, we can now separate, sample and convert the color of the original color into digital information through the pre-press scanning equipment, that is, use the same method as the photoengraving to decompose the original color into red (R), green (G), Blue (B) three colors, and digitize, and then use the computer to mathematically decompose the digital information into cyan (C), magenta (M), yellow (Y), black (K) four-color information.
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