A Study Of Multi-color Printing Color Separation Model

As one of the important and difficult issues in color printing, multi-color printing is being paid more and more attentions, which is not only the demand of the printing theories development, but also the need of high quality printing. On the basis of former studies, the paper mainly works on the Hi-fi color printing color separation algorithms. And the main researches and results are as the following:1. Solutions to Neugebauer Equation SystemNeugebauer Equation System is a system that combines the dot area coverage that has a close relationship with printing quality control with the tristimulus which has a direct relationship with print visual effect, which is an important mathematic model. Though the system is a very important model in printing area, the materials about its solution are infrequent. The paper discusses the solutions completely in the view of math.2. The method of subareasAs the Hi-fi color printing reproduces originals with more than four inks, the regular color separation methods are no longer suitable. The paper introduces a subareas method based on primary color hue angles which successfully applies the Neugebauer Equations to multi-color separation. According to this method, I divide the color separation process into two steps: Firstly, all the color is solved by subareas Neugebauer Equations to get the original separation data; then, substitute the black ink with cyan, magenta and yellow according to the gray balance curve. Every color of the original is reproduced by five hi-fi primary colors finally, which solved the difficulty of the unsuitability of regular color separation methods. In additional, I make a difference between the gray color of the original and the gray component of the color, the two neutral gray is adjusted separately.3. Design and program the experiment systemThe paper got some materials from the standard original to form the experiment original, including highlight, dark tone and persons, all of which are hard to reproduce. And it proved that the theories are correct and feasible.At last, a conclusion is made, and the work need to do in the future is put forward.