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Because the printing process determines that the printing can only use dots to reproduce the continuous tone level of the original, as shown in Figure 1-2.Printing Prepress Image Screening Problem Solving
If you zoom in, you will find that this figure is composed of countless dots of different sizes. We can see that although the dot sizes are different, they all occupy the same space position.Printing Prepress Image Screening Problem Solving
This is because once the original image is screened, the image is divided into countless regularly arranged dots, that is, the continuous tone image information is changed into discrete dot image information. Printing Prepress Image Screening Problem Solving
The larger the dot, the darker the color and the darker the layer; The smaller the dot, the lighter the color, and the brighter the level. The fixed space occupied by each node is determined by the number of screening lines Printing Prepress Image Screening Problem Solving
For example, if the number of dots is 150 LPI, there are 150 dots in one inch length or width. The location of dot space and dot size are two different concepts. Printing Prepress Image Screening Problem Solving
For example, C50% means that the dot size accounts for 50% of the dot space position, and 100% means that the dot size completely covers the dot space position, that is, the so-called “field” in printing. Printing Prepress Image Screening Problem Solving
0% has no dot and only the dot space position, so there is no ink printed in this place. Obviously, the larger the number of mesh, the smaller the space occupied by the dot, Printing Prepress Image Screening Problem Solving
and the more layers can be described, the more delicate. In fact, the level and color of the original are reproduced through this screen hanging method.Printing Prepress Image Screening Problem Solving
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