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N. Shiratori, N. Yoshidomi
We tried to quantitatively evaluate the print mottle of sheet-fed offset in terms of mottle sizes and their distribution. The quantitative method we used was comprised mainly of capturing the print pattern as a light and dark image representing the unevenness of ink density and calculating the mean area and area standard deviation of light parts and dark parts through image analysis. We found that the product of the mean area and area standard deviation of the dark parts correlated very well with the visual evaluation of print mottle.
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Quantitative Evaluation of Print Mottle and Correlation to Subjective Rating, 1994 Coating Conferenc