engleski

Quality Assurance in Digital Printing

In the beginning of its developement, digital printing could only be used for printing onto a paper substrate. Due to its ecological suitability, lately has been an increased interest in application of digital printing technologies to textile substrate. However, there are still many problems to be solved and one of the most important problem is lack of communication between design/coloration operations and print/production processes. One of essential problem is the loss of colour information, which happens during a process of transformation of the RGB system (input device – aditive colour mixing) into CMY system (output device – subtractive colour mixing). Analisys in this paper were carried out with aim of pointing out the importance of lightness value as one of the parameter of colour management that indicates the problem of loss of information. Printed samples of three hue groups were tested: H* 080 – 100 (yellow), H* 260 – 280 (blue) and H* 000 – 010 and 350 – 360 (red). Results obtained, presented in a CIELab terms through dE/Y and dE/L* relationships, showed that problem can be expected in area of yellow hues due to a selectivity problem that occures with increasing of lightness value. Importance of Y tristimulus value that uniquely defines lightness of one coloured surface, was also confirmed.

digital printing; RGB; CMY; loss of information

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