Study of Print Factors Influencing Colour Variation

Pages:54-58
Ambrish Pandey and Neetu Bala (Department of Printing Technology, Guru Jambheshwar University of Science and Technology, Hisar, Haryana)

The selection of print factors and controlling over them determines the colour quality and resulting printed paper colour Lab values. The present paper discusses about the colour value variation and its solution based on the study done for printing on art paper with different sheet-fed offset inks because several factors like dot shape, screen ruling, screening affects the colour value variation to some extent. In this study, a simple experiment is conducted to show how colour value variation can be caused due to various different factors. We have considered same substrate (Imported Art Paper) printed with a family of inks namely Speedset ink & Art-paper ink, having various print factors, assuming that these sheets are printed and measured under same ambient conditions with Adast Dominant 725E and Gretagmacbeth spectroeye respectively. Under such assumptions, colour values measured from art paper is described by Lab, ΔELab, and density graphs. These graphs are used to perform a parametric/comparative study to describe how different factors affect the LAB and Density values and colour quality in respect of both inks. It is demonstrated that different factors can significantly affect the colour values variation with respect to both inks.