Abstract
The purpose of this applied research was to determine the influence of device link profile (DLP) in the color reproduction aimed at the G7 master compliance. The quality of digital color printing is determined by these influential factors: screening method applied, type of printing process, ink (dry-toner or liquid-toner), printer resolution and the substrate (paper). For this research, only the color printing attributes such as the G7 colors hue and chroma, gray balance, and overall color deviations were analyzed to examine the significant differences that exist between the two output profiles [Output Device Profile (ODP) vs Device Link Profile (DLP)]. These are the color attributes which are monitored and managed for quality accuracy during the printing. Printed colorimetry of each profile from the experiment was compared against G7 ColorSpace GRACoL 2013 (CGATS21-2-CRPC6) in CIE L* a* b* space using an IDEAlliance (Chromix/Hutch Color) Curve 4.2.4 application interface with an X-Rite spectrophotometer with an i1iO table. The measured data of each profile were run through this application (Curve 4.2.4). The data were analyzed by using the Verify Tool of the Curve 4.2.4 application to determine the pass/fail of G7 master compliance levels using G7 ColorSpace tolerances (G7 Grayscale, G7 Targeted, and G7 Colorspace). Analyzed data from the experiment revealed that the printed colorimetric values of each profile (G7 Grayscale, G7 Targeted, and G7 Colorspace) are in match (aligned) with the G7 master compliance levels (reference/target) colorimetric values (G7 Grayscale, G7 Targeted, and G7 Colorspace). Therefore, the press run was passed by the Curve 4 application for both the profiles used/tested towards aiming for G7 master compliance.
Highlights
G7 stands for grayscale plus the seven primary and secondary colors known as the subtractive and additive: Cyan, Magenta, Yellow, Black (CMYK) and Red, Green, Blue (RGB)
G7 specifications are owned by International Digital Enterprise Alliance (International Digital Enterprise Alliance- IDEAlliance, 2014) and the colorimetric formulas of the G7 are defined in the American National Standards Institute and the Committee on Graphic Arts Technology Standards/Technical Report (ANSI/CGATS TR015)
The experiment was conducted in a color managed digital printing workflow (CMDPW) to determine the effect that ODP and DLP have on the G7 master compliance: Comparison of Compliance with Output Device Profile (ODP) vs. Device Link Profile (DLP) of Multicolor Digital Printing
Summary
G7 stands for grayscale (or gray) plus the seven primary and secondary colors known as the subtractive and additive: Cyan, Magenta, Yellow, Black (CMYK) and Red, Green, Blue (RGB). G7 is a method which specifies calibration procedures for printing visually acceptable colors with an emphasis on matching colorimetrically derived aim-points for the print reproduction processes to print with a common visual appearance. Digital color print reproduction involves physical/ mechanical interaction among the imaging cylinder, dry/ liquid toner, and the substrate (Avramovic & Novakovic, 2012). The press operator must carefully manage several print parameters, such as the source colors (a source profile of ISO or ANSI standard), press calibration, press characterization (device destination profile), and the screening option. Without controlling these parameters to a print job, a color mismatch would result. Gray balance represents the combination of specific amounts of cyan, magenta, and yellow inks to produce a neutral shade of
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