Abstract
A standard color gamut can be obtained with CMYK samples that are printed with an offset printing system according to the ISO 12647-2:2013. It is possible to enhance or widen the color gamut during the printing process by interfering with the density and dot gain characteristics. Printing with a wider color gamut provides a more vivid area and more depth in color. In this study, print trials were conducted at first with standard values (density, dot gain and such). Then another trial was conducted by changing the density values respectively during the trial. Ink density values for all colors were decreased from the standard value as -0.15D, -0.30D and then increased as +0.15D, +0.30D. Color gamuts of the trials were calculated and compared at the end. It is found that ink density values directly affect color gamut in offset printing. It is also found that the color gamut decreases equally when ink density values decrease and vice versa. However, some printing problems occurred with high density values even though it gave an expanded color.
Highlights
One of the most important reasons of increased print quality is the use of inks with a high coloring feature (Leach & Pierce, 1993)
The critical point is the direct effect of ink film thickness on print quality and color gamut
It is found that ink density values directly affect color gamut in offset printing
Summary
One of the most important reasons of increased print quality is the use of inks with a high coloring feature (Leach & Pierce, 1993). It is very important to have suitable solid ink density values for the used paper surface to achieve the desired print quality and color gamut. When the optimum amount of ink that is transferred onto the paper is set, the print quality as well as the color gamut will increase. It works with three basic signals just as in the human eye L* represents the lightness, a* represents the red/green value, b* represents the yellow/blue value of the color in the CIE L*a*b* system (Tritton, 2004; Adams & Weisberg 2000). The CIE has designed many color models over the years These models differ in the process of technological developments, hue, saturation and brightness are the base components (Sahinbaskan, 2002). In 1976, with a view to approximating perceptual uniformity by emulating the nonlinear response of the human eye, the CIE recommended the CIE L*a*b* space (lightness, position between green and magenta and position between blue and yellow)
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