In the prepress stage, the depth of the manuscript is expressed by dividing the continuous adjustment image of the manuscript into dots of different sizes. The size of the outlet is equal to the ratio of the area of ​​the dot in the unit area to the unit. It is represented by 0-100%. 0 is blank, 100% is the actual site, and 50% is the area and non-network part of the wind within the unit area. The area is half of the area.
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