APPLIANCE OF TWINS AS A WAY FOR ACHIEVING SECURE HIDDEN IMAGE IN INFRARED TECHNOLOGY

Utilizing the situation that except image in visual part of the spectrum can be broadened to near infra red domain that is observed instrumentally, near infra red technology stated its principles. Visual color management leads and controls both domains applying standard reproduction materials. CMYKIR separation principles allow attacking the secondary monochrome image to visual colored one, implementing achromatic principles. As the same color visual output can be performed on various ways, besides mathematical calculations, for accurate reproduction twin colors system is practiced

REDUCTION RATE STRATEGIES BY PROGRAMMED NIR DUAL IMAGE REPRODUCTION PROCESS

Autotypic reproduction used in printing procedures as opposed to standard subtractive system used in color photography, except CMY system components, usually adopts black carbon ink within practiced screening system, commonly denoted as four-color printing. Black color incorporated as black printer or K-channel replenish various features including undercolor adjustments and achromatic interchange, which is crucial for achieving secondary, only near-infrared, NIR detectable image

HIDDEN NIR DUAL IMAGE TECHNOLOGY PRINTED ON THE FABRIC

Dual images printed on fabric are achieved due to INFRAREDESIGN®, through twin colors basic. Tentative part is performed on cotton fabric through CMYKIR technology principles of separation and matching of colors. Sophisticated barrier scanning while procreating testing model, is performed for ultraviolet, visible and near infrared part of the spectrum. This method leads to moving boundary scope of security printing and dual information to a variety of possible printing substrates and sheltered information to materials like silk, cotton, leather, polyester and similar by appliance of twin colors and dual information. These diversity of possible substrates, variations in dyes mixture combinations and coverages allows technologist and designers wide field of concepts, projects and acquirements. IRD technology is based on developing and forming “twin dyes”, whose spectral characteristics for this appliance, some here are presented. Also some additional tools for better visual twins matching are introduced. All observed twins render same spectral characteristics designated as Z domain, beneath 900 nm area with ΔZ difference for “visual and NIR” dyes

BLIZANCI BOJILA ZA PROŠIRENJE INFRA INFORMACIJSKE TEHNOLIGIJE

Druga, proširena slika pripremljena za NIR područje sastavni je dio slike u vidljivom dijelu spektra. Za njene potrebe slika za vizualno područje priređena je i definirana pravilima upravljanja bojama za vizualno područje, dok se druga slika za NIR područje bazira na akromatskoj redukciji osnovnih CMY pokrivenosti uz karbon crnu i instrumentalni prikaz. Budući da je upravljanje bojama u osnovi povezano s vidljivim dijelom, standardno akromatsko podešavanje nije prilagođeno za NIR potrebe, namjenski prilagođeni workflow je prikazan za potrebe druge slike

TWIN COLORS MODE DEDICATED ADJUSTMENT – NECESSITY FOR VISUAL AND NIR IMAGE

Pri stvaranju dvostruke slike primjenom sistema CMYKIR tehnologije, dva odvojena dijela, vizualni i NIR slikovni izlazni oblik se jedinstveno povezuju tvoreći prošireni slikovni doživljaj. Pri promatranju u vizualnom području, nikakvo odstupanje, izobličenje, pozadinska slika ili degradacija nisu prihvatljive. Nasuprot toga, u NIR slici ne smije biti tragova vizualne slike. Sve informacije o obadvije slike su pohranjene u otisnutoj slici postignutoj standardnim reprodukcijskim postupcima. Diferencijacija se postigla pažljivim odabirom bojila i njihovim apsorpcionim svojstvima, gdje su dvojne boje složene po značajkama u vizualnom odnosno NIR području obzirom na svojstva refleksije ili apsorpcije, istovremeno određivajući značajke namjenskog profila.When creating a double image applying CMYKIR system technology, two separate parts, visual and NIR image output, are interconnected together building common widened image experience. When viewed in visual no image deflection, deviation, secondary ghosting or any other derogation are acceptable. From other side NIR image should not have traces of visual image. All information about both mages are stored in printed image accomplished by standard printing means and procedures. Differentiation is obtained by carefully chosen inks absorption properties, where twin colors are arranged according to their visual/NIR reflection or absorption characteristics, contemporaneously determining dedicated profile properties

Suitability of the rgb Channels for a Pixel Manipulation in a Spatial Domain Data Hiding Techniques

The aim of this research was to determine which channel in rgb color space is the most suitable (regarding perceptibility) for a pixel manipulation in a spatial domain data hiding techniques. For this purpose three custom test targets were generated. The research also shows the behavior of two closely related colors in the ps (Print-Scan) process. The results are interpreted using both a quantitative method (statistical comparison) and a qualitative method (visual comparison)

Određivanje područja odgovarajućih gustoća kod primjene kompenzacije crne za izabrani profil

In standard graphic reproduction subtractive system of process inks coverage is observed. For achieving wider reproduction range, as well as higher density, additional black printer is added into printing system. Today graphic arts ISO specification routes defined overall coverage, meaning also black compensation principles. Although, the theoretical substitution of chromatic part of process inks with black can be very high, practical results can render certain misalignments in neutral as well as other tertiary colours, not achieving predicted values. That maintains the demand of additional customization of reproduction for certain images to preserve reproduction quality. A test target proof and soft proof are considered for proposed profiles, including adequate equivalent densities or lightness.U standardnoj grafičkoj reprodukciji promatra se subtraktivni sustav procesnog miješanja boja i pokrivenost bojama. Kako bi se postignuo veći raspon reprodukcije tonova kao i veće zacrnjenje, dodatni crni izvadak se ugrađuje u reprodukcijski sustav. Današnje ISO specofikacije za grafičku reprodukciju preporučaju određenu ukupnu pokrivenost, uključujući principe kompenzacije crne boje. Iako zamjena kromatskog dijela procesnih boja sa crnom može biti vrlo velika, praktični rezultati mogu voditi određenom odstupanju kod neutralnih kao i tercijarnih boja. To upućuje na potrebu dodatne prilagodbe za određene slike kako bi se osigurala kvaliteta reprodukcije. Testna karta je reproducirana kao ekranska i otisnuta za izabrani profil, gdje su postignute odgovarajuće ujednačene gustoće