The desired amount of reduction for coring depends on line width and overall nominal colorant level. Coring, defined as a process whereby the colorant level is reduced in the interior of text or characters, is a remedy for these shortcomings. However, this can result in undesired color shifts and the introduction of halftone texture in light regions. A conventional approach to reduce toner overdevelopment is to restrict the color gamut of printers. Toner scatter caused by toner overdevelopment in color EP laser printers can significantly impact print quality. Since text and lines are indispensable to print quality, many studies have proposed methods for measuring these print quality attributes. Thus, the print quality of color EP laser printers is more important than ever before. The use of color electrophotographic (EP) laser printing systems is growing because of their declining cost.
have recently developed a case based reasoning system for offset print quality control. Developments in this area usually concern creation of print quality test pages (Jang, Chen, Allebach, & Chiu, 2004), simulation of the most common print quality defects (Jang & Allebach, 2005 Kowalczyk & Trksak, 1998), inspection of one or several print quality attributes, such as the actual size and quality of printed dots (Antoine, Lloyd, & Antoine, 2001 Bergman, Verikas, & Bacauskiene, 2005 Chuang & Lai, 1997), mottling (Sadovnikov & Lensu, 2007 Sadovnikov et al., 2005), CCD camera-based estimation of ink density (Brydges, Deppner, Kunzli, Heuberger, & Hersch, 1998 Verikas & Bacauskiene, 2008), automatic detection and classification of various printing defects (Perner, 1994), print graininess (Trepanier, Jordan, & Nguyen, 1998). Since the manual procedures are tedious, time consuming, and the results are subjective as they depend on personal skills and mood, automated printing quality inspection systems are highly appreciated.
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