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Evaluation of the fluctuation properties of the interaction of halftone screens of various lineatures when reproducing full-color images

The article is devoted to the study of the fluctuation properties of the interaction of halftone screens with different lineatures in the process of full-color printing and the development of a method for assessing the visual perception of these interactions. One of the main tasks solved in the process of printing reproduction of graphic information is to maintain uniformity of tone of large background areas in a print. Violation of the uniformity of the tone of these areas leads to fl - disturbances in the reproduction stability of halft screen structures used in the reproduction process, which become noticeable during the visual perception of the finished images. This issue is especially relevant in the manufacture of full-color images, where there is an interaction of several halftone screens produced for four copies of the image, corresponding to the colors of printing synthesis in the process of color separation. A significant influence on the level of fluctuations is exerted not only by the choice of angles of mutual arrangement of these halftone screens, which is regulated by technological standards, but also by the choice of halftone screening lineature. At the same time, compliance with technological standards does not always guarantee a high-quality result. The purpose of the study is to provide the opportuni-ty to choose the optimal lineature of regular halft screening, which, with a combination of these screens, will minimize the level of noticeability of fluctuations (noise) and, as a result, improve the quality of full-color printed materials. To achieve this goal, in the framework of this work, a method for evaluation of the fl properties of the interaction of raster structures based on the calculation of the standard deviation characterizing the histogram of a particular halftone field and, as a result, the level of fluctuations is developed. The developed method allows choosing the optimal halftone screening lineature, which can be used with a double or triple combination of halftone screens. Read more...