Abstract
The purpose of this research was to determine the influence of screening technologies (AM vs. FM) 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 screening technologies (AM vs. FM). These are the color attributes which are monitored and managed for quality accuracy during the printing. Printed colorimetry of each screening 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 screening were run through this application (Curve 4.2.4). The data of each screening 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 screening (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 screening technologies tested.
Highlights
A continuous-tone color image is composed of a full spectrum of shades and color, from near white to dense black
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
The purpose of this applied research was to demonstrate the use of a complete color managed workflow (CMW) and meet the specified G7 master compliance levels by creating and using output device ICC profiles
Summary
A continuous-tone color image is composed of a full spectrum of shades and color, from near white to dense black. In a traditional printing (offset, digital offset, gravure or flexography) workflow, the method by which continuous-tone photographic images are transformed to a printable image is called halftoning. 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 Today, this method (G7) is used in many applications of printing such as offset lithography, flexography, and digital (color laser or inkjet). This method (G7) is used in many applications of printing such as offset lithography, flexography, and digital (color laser or inkjet) It uses a pre-defined one-dimensional neutral print density curve (NPDC) to match neutral tonality/gray balance. These levels demonstrate G7 master capabilities of a print facility
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