Original scientific paper Designing a postage stamp requires positioning of graphic security elements in a limited small format, so the design is made for two states: for the visible spectrum and the infrared spectrum. Individual screening elements are introduced as security elements in the steganography of invisible pictures in the 700 to 1000 nm spectrum. The CMYKIR theory of hiding the infrared message in the picture is extended by mixing process inks with the control of spot twins of the same colour tone in the X0 and X40 states. Two pictures are integrated in the security print; a multicolour picture visible to the naked eye, and another hidden picture visible when illuminated with an IR detecting instrument. The CMYKIR method is joined with the new element's algorithm used for dispersing of the hidden picture's ("Z picture's") fringes. This kind of steganography is applied in the design of postage stamps and it is a new way of securing them. Keywords: CMYKIR separation; individual screen element; infrared design; postage stamps with security features; steganography Steganografija na poštanskoj marci s infracrvenim individualiziranim rasterskim oblicimaIzvorni znanstveni članak Dizajn poštanske marke zahtijeva smještanje grafičkih i zaštitnih elemenata u ograničen mali format pri čemu ni jedan od elemenata ne smije biti zapostavljen. Uvode se individualni rasterski oblici kao element zaštite u steganografiji dvostrukih slika u proširenom vizualnom i infracrvenom spektru od 700 do 1000 nm. Proširuje se CMYKIR teorija skrivanja infracrvene poruke u slici miješanjem procesnih bojila uz kontrolu spot blizanaca tonova u stanju X0 te X40. U sigurnosnom otisku su integrirane dvije slike, višebojna slika vidljiva golim okom, te druga skrivena slika vidljiva aparaturom za infracrveni spektar. CMYKIR metodi pridružuje se algoritam novog rasterskog elementa, koji služi za raspršivanje rubova skrivene slike nazvane "Z slika". Ovaj način steganografije primijenjen je u dizajnu i tisku poštanskih maraka u svrhu njihove zaštite na nov način.Ključne riječi: CMYKIR separacija; individualni rasterski element; infracrveni dizajn; poštanske marke sa sigurnosnim svojstvima; steganografija
Original scientific paperIn the security managing of packaging infrared transparent graphics on polypropylene material is involved. Preparing of dual images of objects, textual messages in visual-V and NIR-Z domain is extended with dual separation which defines new flexographic procedures of colour mixing. Profiles describing and defining V and Z twin pairs are strictly associated with printing conditions. Quality of twin pairs is achieved with spectroscopic analysis of measuring light absorption in visual and near infrared spectrum. Halftoning algorithms support transparent flexographic foil that does not absorb printing inks and does not penetrate into the printing media. Line halftoning element with ''knee'' effect is developed to additionally demonstrate the plasticity of primary objects or letters. The balance between equalizing of inks in the visual domain, and their differentiation in NIR-Z spectral domain is achieved. Relatively coarse shape and structure of screening elements, low ruling, is suitable for additional transparency of graphics, so that the underlying goods packed in foil can be observed. Secondary, hidden graphics is accessible through NIR camera technology. In that way multiple security options are ensured.Keywords: extended NIR separation; spectroscopy of twin dyes; dedicated knee screening shape; transparent polypropylene wrapping packaging material; security graphics Vizualne i infracrvene grafike s primjenom namjenskog postupka rastriranja za prozirnu polipropilensku ambalažuIzvorni znanstveni članak U sigurnosni sustav ambalaže uvodi se infracrvena transparentna grafika na polipropilenskom materijalu. Priprema dvojnih slika objekata, tekstova u vidljivom-V i NIR-Z području, proširena je dvojnom separacijom koja definira nove fleksotiskarske postupke miješanja bojila. Profili koji opisuju i definiraju parove V i Z blizanaca striktno su povezani sa uvjetima tiskarske tehnologije. Kvaliteta blizanaca bojila potvrđuje se spektroskopskim postupcima mjerenja apsorpcije svjetla u vizualnom i infracrvenom spektru. Rasterski algoritmi podržavaju transparentnu foliju za flekso reprodukciju koja ne upija tiskarsku boju i ne penetrira u polipropilenski medij. Razvijen je linijski rasterski algoritam efekta ''koljena'' koji dodatno potpomaže plastičnosti primarnih objekata ili slova. Postignuta je ravnoteža ujednačenosti bojila u vidljivom spektru kao i njihova različitost u NIR-Z spektru. Relativno gruba struktura rasterskih oblika, niska linijatura, pogodna je za postizanje dodatne transparentnosti grafike kako bi se upakirani sadržaj ispod folije mogao vidjeti. Sekundarna, skrivena slika je dostupna preko tehnologije NIR kamera. Na taj se način osiguravaju višestruke mogućnosti zaštite.
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