Abstract
In this paper, the correlation between the amount of dampening water on an offset printing plate and the intensity of speckle patterns generated on the plate is examined by experiment and numerical simulation. In experiment, speckle pattern observation is performed for two different conditions that the plate is at rest and dynamically move attached to a rotating cylinder to evaluate the feasibility of speckle intensity method in offset printing system. In numerical simulation, time variation of speckle intensity is simulated with the model of the distribution of dampening water on an offset printing plate, considering the reflection factors on water surface and the printing plate. From the results, it is seen that the speckle intensity method has usability on dynamic condition and speckle intensity depends on observation angle.
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