The Research On The Suppression Of The Moire In Color Printing

In the color printing, the appearance of moire has affected the print quality seriously. Therefore, if we can effectively suppress the appearance of the moire, which will improve both the print quality and the production efficiency .The purpose of this article is to propose different ways for different type moires in color printing. Firstly, with the aid of the fish bones chart analysis method, this article points out two most important moires in color printing: moire in scanned halftone picture and moire in color seperation. Then, analyse the reasons and the main influencing factors of the above two moires. Next, separately proposes the different suppression method for the two different moires.Finally, confirms the the feasibility of the methods through the experiments. The key points of this article are the mechanism analysis of the moire in scanned halftone picture and the moire in color seperation and the experiments. Regarding the moire in scanned halftone picture, this article will rely on the Fourier transform to describe the confusion between halftone screen and scanning screen. About the moire in color seperation, this article depends on an optical model to analyse the superposed moire patterns in halftone screen based on the geometry and the Fourier spectral analysis. After examining the basic case of cosinusoidal grating superpositions, step by step, through the cases of square grids and dot screens. Then, based on these results, we focus on the moire phenomenon from the view of the dynamic point .