| 摘要 |
production of printed matter. SUBSTANCE: color original copy is treated, and color- separated half-tone images of each color are subjected to rastering, and the obtained rastered images are used for production of printing plates. Guilloche is used for rastering, whose pattern for each half-tone image of a definite color is different. EFFECT: enhanced degree of protection against copying of printed matter due to production of a complex raster pattern, consisting of three patterns, simplified process of rastering. 3 dwg
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