In CMYK Printing, the colors we used are Cyan, Magenta, Yellow and Key, or CMYK, which can be used in different proportions and superimposed to create a variety of colors. While printing, we use the original image to broken down into four color channels, which corresponding to a color. Then, by controlling the amount of ink in each color channel, we superimpose the color on the printing medium layer by layer. Finally, a complete color image succeed.