Because printing process determines that printing can only use dot to reproduce the continuous adjustment of the manuscript. If enlarged, it will be composed of numerous dots. We see that although dot sizes are different, they all occupy the same size space location. This is because once the manuscript image is screened, the image is segmented into numerous regularly arranged dots, that is, continuous image information is transformed into discrete dot image information.
The bigger the dot, the darker the color, the darker the layer; the smaller the dot, the lighter the color, the brighter the expression. Fixed size of each node occupies space position is determined by the screen line number, for example, add the item number 150lpi has outlets, 150 outlets in the length or width of an inch on.
The location of the space dot and dot sizes are two different concepts, such as C50% represents the dot size space of 50% outlets, 100% refers to the dot size covering all position outlets, printing referred to in the "field", because there is no 0% outlets, only the dot space position, so this place no ink was printed on. Obviously, the greater the net mesh size, network space is small, can the level of description is more, more delicate. In fact, the level and color of the manuscript are reproduced by this way of hanging the net.
