Polytechnic and design, Vol. 7 No. 2, 2019.
Original scientific paper
https://doi.org/10.19279/TVZ.PD.2019-7-2-06
DISCUSSION AND COMPARISON OF CMYKIR AND GRADUAL GCR SEPARATIONS OF COLORS AND DYES
Silvio Plehati
orcid.org/0000-0003-4244-1464
; Fotosoft d.o.o., Zagreb, Croatia
Jana Žiljak Gršić
; Zagreb University of Applied Sciences, Zagreb, Croatia
Nikolina Stanić Loknar
; University of Zagreb, Faculty of Graphic Arts, Zagreb, Croatia
Abstract
In this study, we compare the two types of color separations from RGB (V - visually) digital record to the CMYK dyes which will be printed. Separations are based on different premise in the application, and each one is dedicated to its specific task, which gives different results. The algorithms use the properties of process CMY dyes that we change with carbon black dye by the GCR method. In the CMYKIR separation enters an additional independent monochromatic image named as "Z". This image contains the desired values for channel/component K. By successfully installing the Z image into the K channel, we will achieve the goal of manifesting and recognizing this Z image only in the NIR spectrum. The picture is hidden from the naked eye. In this article, we publish the CMYKIR separation model using regression equations for offset printing. For several selected dyes from the test photo, we present values of today's practice of GCR separation in five degrees. For the same colors, we have shown numerical values for the CMYKIR model for the carbon black 40% coverage. We compared existing gradual GCR models with a continuous selection of K values in CMYKIR separation. Selected colors demonstrate constraints and the possible use of CMYKIR separation
Keywords
GCR; CMYKIR; colour separation; infrared; INFRAREDESIGN
Hrčak ID:
223325
URI
Publication date:
24.6.2019.
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