1 dot angle discrimination method: When the original color is decomposed, different halftone angles are used for the printing plate images of each color. Therefore, the angle of each dot represents a color printing plate, and the general yellow plate is 90°. , Magenta or Blue with a 45° (or 75°) black version with 15°.
2 Graphic shades contrast discriminating method: to distinguish the shades of the printing plates by comparing the shades of the plate layout with the proofs (or manuscripts) in the same position.
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