The Comprehensive Study Of Dot Coverage Based On Halftone Prints

Image copy has become an important field in the printing process. Especially, with the development of science and technology and the improvement of people's living standards, the importance of image's tones, colors and definition are becoming more and more prominent. So the research of image copy in printing process has been a very active subject. We need a complete system to reappear the tones and colors of image loyally. But Due to the all kinds of the limited conditions in the printing process we can't copy the continuous-tone image directly. The incomparably most common way of reproducing images in print is by halftoning which is a way to perform the tones by dots. As the image in the eye of people is the combined effect, it still perform a detailed image in the end.Whenever such a reproduction is used, a ubiquitous effect called dot gain comes into play and makes the actual image appear darker than what would have been expected from a perfect reproduction. Therefore, we need to control parameters in the printing process by predicting the change of the dot size. Dot gain has been widely known and studied for half a century, but analyzing and modeling it has presented a problem. Good models are needed to accurately predict the color rendering properties of various imaging systems, so we want to enhance the modern based on the Neugebauer equations. The dot gain may be different .It depends on which solid ink the considered halftone layer is superposed. So we extend the model by computing the effective surface coverage of a dot according to its superposition conditions. In the present contribution, we also especially improve the Yule-Nielsen modified Neugebauer model by optimizing the n-factor of the YNSN. Then a test was carried out to demonstrate the model can be better to predict the coverage of dots and satisfy the requirements of people.