| This paper mainly discusses the problems of how to establish mathematical model and the model of automated retrieval of offset printing.At the beginning of the paper, the theory of reproduction of image color and color-generation model is introduced briefly, and then introduces the theoretical principle—Neugebauer Equation of this paper. Because of Neugebauer Equation was established in the assumed conditions of color cell value and chromatic value, there are many factors making low solving accuracy of the equation. So the paper corrects Neugebauer Equation with regression to make it more universality, gets the regression coefficient, and establishes computer color matching (CCM) mathematical model. And then validates corrected Neugebauer Equation with chromatic aberration distribution curve through chromatic aberration calculation between calculated value and measured value of standard samples.Then the formula database is established through experiment of color matching. I establish the model of quantity and thickness of ink through analyzing the relation between quantity and thickness of ink by using least square method ascertain the quantity of ink in the experiment of data collection before the experiment. At last, automated retrieval model is established on account of Nearest Neighbor Approach and the precision rate of the model is validated.The mathematical model of color matching which is established basing on Neugebauer Equation affords important theoretical principle and model to CCM, computer management of printing copy technology, printing color management, quality control of digital printing and direct detection of typographic image, also affords a practice method and theory evidence to intensive study of CCM. The automated retrieval model on account of Nearest Neighbor Approach can manage the formula scientifically, and preserve the departed ink formula effectively to ensure the repeatability of color matching. |
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