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Mottling is one of the most important printing defects in modern offset printing. It can be defined as undesired unevenness in perceived print density. In our research, the print mottle image on paper surface was acquired through a scanner, and then through software analysis. It was studied from the perspective of digital image processing. Then, the method was proposed to apply in newsprint paper, inkjet paper, offset paper, and coated paper. We compared the proposed method with the traditional method. The results showed that the print mottle index in descending order is: offset paper, newspaper, coated paper, and inkjet paper. The new method can be easily used to analyze print mottle. Meanwhile, it is simpler and more objective using the modified coefficient of variation to characterize print mottle. The evaluating method for print mottle based on digital image processing technology has some practical value for analyzing and solving various paper print mottle problems.
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- Research on Evaluating Method for Print Mottle Based on Digital Image Processing
- Springer Singapore
- Chapter 41