engleski

Infrared colorants as twins for security printing of documents and securities

Twin colorants are demonstrated in the technology of mutual concealment of two integrated graphics printed together in the same place. We set up a double reproduction state with a given mathematical model for SWOP colorsetting which is suited for colorant management in two spectrums: the visual and near infrared. Double portrait images, face and profile, in one print but each separately identifiable ; or in a visual or infrared light spectrum. Development of dye twins that have the same visual values (L * a * b I RGB) and different values of Z [I] is the starting point for calculating the Z- regression. Proposed is a new mathematical model Z- regression as a special form of CMYKIR separation [2]. The aim is to calculate the colorsetting with a fixed value of the coverage of the K channel, and for all the color tones. Sets is a new algorithm that will allow the calculation of the value of X40 for all dye color tones and their replacements of X40 depending on the X0.This is a completely different approach to separation and has its own purpose: the set value K before separation C, M, Y allows the creation of a hidden image into a reproduction. that is not visible to the human eye but that becomes visible with the use of infrared glasses. Printing with process colors in the conventional raster technology is designed for multicolor protective press. Recipes are given for mixing of process CMYK colorants for creating the SWOP twins which the Z-regression can use to produce spot colors with applications in the security printing, with the title , camouflage reproduction'.

CMYKIR separation ; Z-regression ; Colorant twins ; Camouflage reproduction ; Near infrared spectrum in the press

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