EVALUATING THE INFLUENCE OF RASTER STRUCTURES ON TONE REPRODUCTION IN OFFSET PRINTING

UDC 551.583;581.5

 

Tashmuhamedova Shizhoat Bositovna – post-doctoral student, the Department of Technology of Printing and Packaging Processes. Tashkent Institute of Textile and Light Industry (5, Shokhzhakhon str., 100100, Tashkent, Republic of Usbekistan). E-mail: shijoat0803@gmail.com

Bulanov Ismail Abdulmuminovich – PhD (Engineering), Assistant Professor, the Department of Technology of Printing and Packaging Processes. Tashkent Institute of Textile and Light Industry (5, Shokhzhakhon str., 100100, Tashkent, Republic of Usbekistan). E-mail: i.bulanow@gmail.com

Babakhanova Khalima Abishevna – DSc (Engineering), Professor, the Department of Technology of Printing and Packaging Processes. Tashkent Institute of Textile and Light Industry (5, Shokhzhakhon str., 100100, Tashkent, Republic of Uzbekistan). E-mail: halima300@inbox.ru

Gromyko Irina Grigor’yevna – PhD (Engineering), Associate Professor, Head of the Department of Printing Production. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: gromyko@belstu.by

Sipaila Siarhei Uladzimiravich – PhD (Engineering), Associate Professor, Assistant Professor, the Department of Printing Production. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: svsip@yandex.by

DOI: https://doi.org/10.52065/2520-6729-2024-279-3.

 

Key words: rasterization, regular, stochastic, hybrid raster, print quality, tone reproduction, dot sharpness.

For citation: Tashmuhamedova Sh. B., Bulanov I. A., Babakhanova Kh. A., Gromyko I. G., Sipaila S. U. Evaluating the influence of raster structures on tone reproduction in offset printing. Proceedings of BSTU, issue 4, Print- and Mediatechnologies, 2024, no. 1 (279), pp. 19–26 (In Russian). DOI: 10.52065/2520-6729-2024-279-3.

Abstract

The article examines the influence of various raster structures on tone reproduction in offset printing. To assess the quality of reproduction of halftone images using regular, stochastic and hybrid rasterization, a test object was developed using Adobe Photoshop and CorelDRAW programs. Printing plates are made on Agfa Avalon N8-20 plate equipment using “Computer-to-Plate” technology based on digital thermal plates from AGFA. When printing on a Speedmaster CD 102-5 LX offset sheetfed press, a series of RAPID Platinum process inks and seven types of paper of various densities (offset, label, self-adhesive, coated glossy, coated matte, coated, cardboard) are used. It has been revealed that the use of hybrid rasters with correctly selected lineature provides the best combination of tone reproduction accuracy and degree of image detail compared to other rasterization methods. When using hybrid screening technology, stable reproduction of raster dots is achieved in different areas of the tonal interval, even with high raster lineatures, which can significantly increase the detail of image reproduction compared to a regular raster, but requires compensation for increased dot gain at the pre-printing stage.

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References

  1. Kuznetsov Yu. V. Tekhnologiya obrabotki izobrazitel’noy informatsii [Processing technology of graphic information]. St. Petersburg, Peterburgskiy institut pechati Publ., 2002. 312 p. (In Russian).
  2. Andreev Yu. S., Makeeva T. A. Sharpness properties of raster structures. Izvestiya vysshikh uchebnykh zavedeniy. Problemy poligrafii i izdatel’skogo dela [News of higher educational institutions. Problems of printing and publishing], 2006, no. 1, pp. 3–13 (In Russian).
  3. Litunov S. N. Analysis of methods for rasterizing tone images. Omskiy nauchnyy vestnik [Omsk Scientific Bulletin], 2006, no. 2, pp. 160–161 (In Russian).
  4. Shchadenko A. A. Adaptive raster conversion of images in autotype printing technology. Izvestiya vysshikh uchebnykh zavedeniy. Problemy poligrafii i izdatel’skogo dela [News of higher educational institutions. Problems of printing and publishing], 2009, no. 1, pp. 59–68 (In Russian).
  5. Kostyuk I. V. Metody otsenki effektivnosti tekhnologii adaptivnogo rastrirovaniya. Avtoreferat dissertatsii kandidata tekhnicheskikh nauk [Methods for assessing the effectiveness of adaptive rasterization technology. Abstract of thesis PhD (Engineering)]. Moscow, 2010. 20 p. (In Russian).
  6. Kippkhan G. Entsiklopediya po pechatnym sredstvam informatsii. Tekhnologii i sposoby proizvodstva [Encyclopedia of Printed Media. Technologies and production methods]. Moscow, MGUP Publ., 2003. 1280 p. (In Russian).
  7. Makeeva T. A. Chetkost’ v poligraficheskoy rastrovoy reproduktsii – formirovaniye i upravleniye. Avtoreferat dissertatsii kandidata tekhnicheskikh nauk [Precision in printed raster reproduction – formation and management. Abstract of thesis PhD (Engineering)]. Moscow, 2006. 24 p. (In Russian).
  8. Gur’yanova O. A., Krylova M. A. Study of the occurrence of object moire when using various systems of irregular and hybrid rasterization. Vestnik Moskovskogo gosudarstvennogo universiteta pechati [Bulletin of the Moscow State University of Printing], 2010, no. 11, pp. 58–63 (In Russian).
  9. Gur’yanova O. A. Razrabotka metodologii protsessa vybora rastrirovaniya v poligraficheskikh ustroystvakh dopechatnoy obrabotki izobrazheniy. Avtoreferat dissertatsii kandidata tekhnicheskikh nauk [Development of a methodology for the process of selecting screening in printing devices for pre-press image processing. Abstract of thesis PhD (Engineering)]. Moscow, 2015. 25 p. (In Russian).
  10. Pukhova E. A. Razrabotka metodov gradatsionnykh preobrazovaniy v protsesse dopechatnoy podgotovki izobrazheniy k poligraficheskomu vosproizvedeniyu. Avtoreferat dissertatsii kandidata tekhnicheskikh nauk [Development of methods of gradation transformations in the process of prepress preparation of images for printing reproduction. Abstract of thesis PhD (Engineering)]. Moscow, 2015. 25 p. (In Russian).
  11. Sevryugin V. R. Nauchnyye i metodologicheskiye osnovy vosproizvedeniya binarnykh izobrazheniy v protsessakh poelementnoy zapisi poligraficheskikh reproduktsionnykh system. Avtoreferat dissertatsii kandidata tekhnicheskikh nauk [Scientific and methodological foundations of reproducing binary images in the processes of element-by-element recording of printing reproduction systems. Abstract of thesis DSc (Engineering)]. Moscow, 2013. 39 p. (In Russian).
  12. Chebotareva I. B., Chebotarev R. I., Shkarlat V. Yu. Problems of quality printing when using hybrid rasterization. Available at: https://openarchive.nure.ua/bitstreams/3b8c7a33-9c13-4143-939e-408cd71a031c/ download (accessed 13.11.2023) (In Russian).
  13. Shchegolev I. O. About raster selection. Part 4. Fabulous. Angles of rotation or tilt of the raster. Komp’yuArt [Computer Art], 2010, no. 5, pp. 28–31 (In Russian). 14. Gudilin D. Hybrid rasters, or “Michurinsky” experiments in printing. Available at: https://compuart.ru/ article/8704 (accessed 13.11.2023) (In Russian).
  14. Gudilin D. Rasterization in the rhythm of samba. Available at: https://www.labelworld.ru/ %D1%8F%D0%BD%D0%B2%D0%B0%D1%80%D1%8C-2003-%D0%B3/rastrirovanie-v-ritme-samby (accessed 13.11.2023) (In Russian).
  15. Gur’yanova O. A., Andreev Yu. S. Selection of irregular rasters for reproducing images containing a regular component. Izvestiya vysshikh uchebnykh zavedeniy. Problemy poligrafii i izdatel’skogo dela [News of higher educational institutions. Problems of printing and publishing], 2013, no. 5, pp. 46–51 (In Russian).
  16. Litunov S. N., Gribanovskiy B. F., Shcheglov S. A. A method of printing reproduction of color images using an irregular raster. Patent RU 2290679, 2006 (In Russian).
  17. Yuldashev Yu. N. Study of rasters with a concentric point structure. Available at: https://cyberleninka.ru/ article/n/issledovanie-rastrov-s-kontsentricheskoy-strukturoy-tochki/viewer (accessed 13.11.2023) (In Russian).
  18. Katsman V. D. Modeling a moire-resistant raster based on quasiperiodic structures. Izvestiya vysshikh uchebnykh zavedeniy. Problemy poligrafii i izdatel’skogo dela [News of higher educational institutions. Problems of printing and publishing], 2012, no. 5, pp. 22–29 (In Russian).
  19. Anisovich A. G., Markevich M. I., Malyshko A. N. Some features of microscopic examination of non-metallic objects. Lit’ye i metallurgiya [Casting and metallurgy], 2020, no. 2, pp. 75–80 (In Russian)

15.01.2024