The point-to-face ratio (or size contrast) used in color is mainly used in the design process of a packaging screen. The contrast from a center or concentrated point to the overall screen is used on the pigment, that is, the contrast between small and large screens. Compared. In daily life, especially in washing and cosmetics products, we can see that the whole area is clean and there is nothing on the packaging box of a product, and there is a very obvious small square (or Oval or small circle) and then the theme of the brand and name of the package content is reflected on the screen of this small square. This is not only a combination of point and surface, but also a contrast between big and small, and occasionally from point to point. And the contrast of gradual transition.