Rudolf, Maja (2013) Zaštitna grafika poštanskih maraka dualnim svojstvima bojila sa parametrom Z i individualiziranim rasterskim elementom. Dissertation (PhD) thesis. Grafički fakutet. [Mentor: Žiljak, Vilko].
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Abstract
U radu se postavljaju visoki standardi dizajna za tehnološku izvedu poštanskih maraka kao vrijednosnica na bazi teorije Infraredesigna. Zbog stalne potrebe za novim zaštitama u borbi protiv krivotvorenja, tisak je podređen korištenju inovacija i patenata. Rad je posvećen višestrukoj zaštiti poštanskih maraka, kako bi se osigurala njihova autentičnost. Kreiraju se zaštitni elementi temeljeni na tehnologiji skrivanja infracrvene Z slike unutar vidljive slike. Modeliraju se rasterski elementi koji sudjeluju u kreiranju grafike u proširenom spektru od 400 do 1000nm. Konvencionalno rastriranje se zamjenjuje individualizirano dizajniranim rasterskim elementima kako bi se postigla raspršenost rubova skrivene slike te na taj način unaprijedilo sakrivanje čime se potvrđuje hipoteza da rasterski element sa bitmapiranim elementom slike onemogućava krivotvorenje. Dizajn nove poštanske marke se izvodi planiranim spot bojama sa Z parametrom. Izvode se detaljni proračuni novih Z spot bojila za prošireni spektar u uvjetima ofsetnog tiska. Eksperimentalno je postavljena i dokazana osmerobojna spot CMYKIR separacija sa četiri VS/IR blizanca boja. Definiraju se nove faze dizajna za potrebe kreiranja dvostruke informacije. Daju se novi algoritmi u optimizaciji grafika za vidljivi i infracrveni dio spektra. Izvedeno je šest modela CMYKIR separacije koji odgovaraju na specifične probleme na koje se nailazi u različitim zahtjevima dizajna. Kroz eksperimentalne primjere poštanskih maraka se detaljno analiziraju problemi kod realizacije otisaka sa skrivenom grafikom. Na njih je primijenjena proširena teorija CMYKIR separacije. Kombiniranjem takvih grafika sa individualiziranim rasterima dolazi se do potpunog skrivanja infracrvene informacije u vidljivom dijelu spektra te se postiže vrhunska zaštita poštanske marke, čime se potvrđuje hipoteza o nemogućnosti krivotvorenja. Ujedno se udovoljava i visokim dizajnerskim zahtjevima za kreiranjem bogatih grafika te se postiže dvostruko iskorištenje ograničenih dimenzija poštanske marke.
| Item Type: | Dissertation (PhD) thesis |
|---|---|
| Mentor name: | Žiljak, Vilko |
| Thesis Committee: | Žiljak, Vilko and Pap, Klaudio and Boras, Damir and Mrvac, Nikola and Parac-Osterman, Đurđica |
| Defence date: | 19 June 2013 |
| Abstract in english: | High standards are set up for printing technology of postage stamps, as security papers, based on Infraredesign theory. Fighting the counterfeiters, there is a constant need for new security features. Printing process is subject to utilization of innovations and new patents. This work is dedicated to developing multilayered protection of postage stamps to ensure its' authenticity. New protective features are designed, based on technology of hiding Z image in visible image. Models of screening elements are set in the extended spectral area from 400 to 1000nm. Conventional screening is replaced with uniquely designed screens to produce dispersion of edges of graphic. Such dispersion significantly improves hiding abilities. Design of new postage stamp is carried out with planned spot colors with parameter Z. Eight color spot CMYKIR separation with four VS/IR twin colors is set up and experimentally proven in designing new postage stamp. Detailed calculations of Z spot colors are carried out, for purpose of creating double information. New algorithms are given that deal with optimization of graphics for visible and infrared part of the spectrum. Six new models of CMYKIR separation are carried out that reply to specific problems which are encountered in various design demands. Through experimental examples of postage stamps detailed analysis is carried out of known issues in realization of prints with hidden graphics. Extended theory of CMYKIR separation is applied to new postage stamps. Experimental examples of stamp design use new Z spot colors in CMYKIR separation. Combining such graphics with individualized screen shapes produces total hiding of infrared information in the visible part of the spectrum. Protection of newly designed postage stamp is superior to existing protection elements because it cannot be reproduced in a conventional way. At the same time, high standards for designing rich graphics are satisfied. Also double space is gained for designing information which is important because of limited dimensions of postage stamp. |
| Uncontrolled Keywords: | poštanska marka, Z spot boje, individualizirani rasterski element, dvostruka grafika, bliski infracrveni spektar u tiskarstvu, steganografija |
| Keywords in english: | postage stamp, Z spot color, individual screen element, double graphics, near infrared spectrum in printing technology, steganography |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakutet |
| City: | Zagreb |
| Number of Pages: | 160 |
| Callnumber: | 655.3:343.51 rud d |
| Inventory number: | 9510 |
| Depositing User: | Dora Budić |
| Status: | Unpublished |
| Date Deposited: | 30 Apr 2014 07:35 |
| Last Modified: | 30 Apr 2014 07:35 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/1896 |
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