Abstract
The purpose of this applied research was to determine the Color Managed Digital Printing Workflow (CMDPW) consistency (4th C of the color management) over a period of time [100 days, (N = 100)]. The quality of digital color printing is determined by these influential factors: screening method applied, type of printing process, calibration method, device profile, ink (dry-toner or liquid-toner), printer resolution and the substrate (paper). For this research, only the color printing attributes such as the overall average color deviation [ACD, ΔE (2000)] and the solid ink density (SID) were analyzed to examine the CMDPW process consistency in a day-to-day digital printing operation. These are the color attributes which are monitored and managed for quality accuracy during the printing. Printed colors of the random sample size (n = 80) were measured against the GRACoL2013 standards to derive the colorimetric/densitometric values. Reference colorimetric values used in the analysis were the threshold deviations (acceptable color deviations) as outlined in the ISO12647-7 standards (GRACoL2013). A control charts analysis was applied for further determining the process (CMDPW) SID and ACD variation. The data collected were run through multiple software applications (MS-Excel/SPSS/Minitab) to apply various statistical methods. Analyzed data from the experiment revealed that the printed colorimetric values were in match (aligned) with the GRACoL 2013 (reference/target). Since the SID values of CMYK colors were in control throughout the process, this enabled the CMDPW to produce consistent acceptable color deviation (Average Printed ΔE (2000) = 2.978; SD = 0.437; Acceptable Threshold color deviation is ΔE (2000) ≤ 3.00).
Highlights
Over the past three decades, the printing industry has been revolutionized
The experiment was conducted in a color managed digital printing workflow (CMDPW)
Findings were not expected to be generalizable to other Color Managed Digital Printing Workflow (CMDPW) environments
Summary
Over the past three decades, the printing (graphic arts or graphic communications) industry has been revolutionized. In a CMDPW, use of SPC is a scientific technique to control, manage, analyze and improve the performance of a process by eliminating special causes of variation in the digital printing process (Thor et al, 2007) It is a powerful collection of problem-solving tools useful in achieving process stability and improving capability through education on variability (Abtew et al, 2018). The experiment was conducted in a color managed digital printing workflow (CMDPW) The purpose of this applied study is to determine the consistency (4th C of CMW) of colorimetric variation among the printed colors overall average color (CMYK-RGB) deviation (ΔE) and CMYK solid ink density (SID) variation in the electro-photographic color printing process over a period of time (100 days). Determine the deviation in the Solid Ink Density (SID) of CMYK colors over a period of time (100 days) by comparing the printed colorimetry against the reference colorimetry
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