Principle: a, network conformation
1. The role of the network, node in lithographic replication process, play a special role of the following:

    1.1 points of the original color level, have the effect of faithful copy, transfer.

    1.2. Outlets on the lithographic plate, the smallest unit of sense of fat as a foundation for formation of graphic.

     1.3 points in the printing color combination, decided to the size of the inking amount, to play the role of a tissue color and image contour.

2. Network line number:

     2.1. Network line number: the number of line network, is refers to the length per inch on the screen in a one-way parallel lines.If within an inch of unit length, are equal to the thickness of the lines to Yin and Yang (that is, black and white line) 100, called 100 line; if each article 150 black and white, Yin and Yang line, it is called a 150 line.

Commonly used inch screen line number is: 60, 65, 100, 120, 133, 133, 175, 150 line, etc.The greater the number, line number is fine, the smaller the dot per unit area, the richer the performance level.The smaller the number, line number, the more coarse, dot per unit area is larger, the less rich performance levels.