engleski

Process color management for producing double images

Studying the way printing inks behave under the influence of light in the area from 100 to 1000 nm has given space for new proposals and document protection methods as well as controlling information produced in the form of graphics. Each color has its own savevalue of response and its own reflection and light absorption characteristics. Printing inks cyan, magenta, yellow and carbon black are the basics for today's color printing. Many studies have proven that the application of the listed colors is satisfactory for color reproduction visible in the human eye visibility range. Due to the fact that these colors respond differently in the IR area, algorithms have been set for controlling multiple RGB/CMYK separations with the goal being to create « infrared graphics» .The subject of our research and innovations is two images being reproduced simultaneously with the same colors and in the same place, of which one is visible in daylight and the other under IR light. This thesis has been put forward and then proven on basis of experiments. Finally it has been applied in many designs: first in printing securities and now in general graphics and industrial design. The idea of « double separation» has been introduced, the procedure of CMYKIR color separation. Algorithms have been developed for integrating several original images that are either for pixel images, vector images or algorithm images. This report contains demonstrations with various types of merging, as well as individualized solutions in infrared graphics. No such research work has been carried out to date. Only IR graphics in the form of a single IR image is applied in banknotes, and as one spot color only that is in comparison of minor effect, without theoretical or software basis. This report shows that an unlimited number of color tones may be applied in one and the same print, and each tone can have multiple visibility characteristics in the planned wavelengths. Response, reflection and absorption, infrared effect is registered with instruments - a camera that has an IR source. This report contains presentations of relations in color arranging basics with double characteristics and the formalism for explaining the interdependency of color tones in the visible and the infrared areas.

security ; infrared ; graphic technology

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