Abstract

To adapt to the dynamic demands of printers and customers, a variety of printing processes have emerged in the printing industry. Among these, digital printing stands out as the most rapid and advancing technique in contemporary times. Two prominent components of digital printing, employed for printing on cellulosic substrates, encompass the Dry Electro-photography (DEP) and Inkjet technologies. This paper aims to juxtapose the print-edge characteristics between Dry Electro-photography (DEP) and Inkjet technologies using the Human Standard Observation Method. In order to accomplish this objective, a comprehensive test chart was generated using Corel Draw Graphic Suite 20, integrating diverse test image elements such as line drawings, continuous tones, and solid images. Subsequently, this test chart was printed using available Dry-toner Electrophotographic and Inkjet printing presses within the local market, employing uncoated, matte coated, and gloss coated papers. The assessment of print-edge attributes encompassed Graininess, Mottle, Voids, and Fill, all in accordance with ISO 13660 standards. The evaluation of print-edge qualities was conducted through the participation of Standard Human Observers who successfully passed the Ishihara Test. By averaging the outcomes from twenty observers, the results were collated and subjected to further analysis and discussion.

Keywords: – DEP (Dry Electro-photography), Inkjet printing press, Human Standard Observer, Graininess, Mottle, Voids, Fill, Ishihara Test, Digital Printing process.