High fidelity screening printing technology introduction (3)

1. High-fidelity color technology development

High-fidelity color was officially used as a noun, beginning at the Seybold Symposium (Boston, USA) in the spring of 1993. At the meeting, the Davis Company opened up a gallery to show viewers proofs printed using FM technology. The proofs were called The preliminary results of the "high-fidelity color" scientific research project--printing using more than four colors for separation printing. Up to now, there are nearly 100 companies in the world participating in this research project, including most of the international companies that have a prominent position in the prepress technology field. The goal of this project is to explore issues related to a series of theories, processes, and market trends brought about by adopting advanced technologies such as FM network points and multi-color screening. At the beginning of 1994, the color separation software launched by the Computer Research Institute of Peking University could realize the seven-color separation, which was based on the frequency modulation technology and laid the foundation for high-fidelity color platemaking technology.

2. The Significance of High-fidelity Separation Technology

High-fidelity printing technology is relative to the four-color printing technology. In four-color printing, four-color inks C, M, Y, and K are used for printing. In theory, it is sufficient to use three colors of C, M, and Y inks. However, in fact, due to various technological reasons, black ink is still needed. Also, secondary colors that are superimposed by two basic colors are not satisfactory, and secondary color spot inks must also be added. Such as M, Y two ink superimposed red than the special red ink is bright. Under this theoretical premise, high-fidelity printing was produced, that is, several spot color printings were added on the basis of four-color printing in order to expand the color expression ability of prints. The conventional color separation technology divides the colors of the original into three basic colors of cyan, magenta, and yellow, and adds black to form the range of chromatograms that the print can represent. Compared to natural colors, this range (called color coverage or umbrella cover) is much smaller. In other words, the rich colors of the natural world cannot be demonstrated with only four types of inks. The use of six-color, seven-color, eight-color high-fidelity color to produce prints, one of its purposes is to expand the scope of color reproduction, more vivid reflection of nature. Because prints with more than four colors for separation printing cannot be reproduced using conventional four-color separation technology, this technology has a special place in high value-added prints.

3. High-fidelity color problem

High-fidelity color can expand the color space that can be expressed in printing, thus improving the quality of printed color reproduction. One of the problems that high-fidelity color printing solves is how to properly achieve the color of the original object in the process of color reproduction, and what colors need to be added in addition to the four basic colors in order to more perfectly reproduce the original color. In general, this question does not have the same answer, because different prints have different themes and there is a difference in the color focus that needs to be expressed. According to the deficiency of traditional four-color ink performance color gamut, a multi-color printing method was proposed. However, for general and practical process requirements, there are basic choices to suit most users' needs. For example, the basic colors used in the Kupper and Linltype-HeVCF color systems are C, M, Y, K, Orange, Green and purple, which is characterized by the maximum expansion of the coverage area in the chromatogram, taking into account the practical aspects of production; the latter chromatogram represents a larger range than the former, and the color separation is achieved through the second scan. The basic colors used in the Pantone 6 color system are C, M, Y, î”±, blue, and green. The feature is to include Pantone chromatography as much as possible and reproduce Ektachrome offset printing chromatography to meet the market's many 6-color printing presses. The basic colors used by Scitex are C, M, Y, K, red, green, and blue, which are characterized by two components of seven colors resulting from two operations of an RGB scan. The basic colors used by Crosfield HyperColor are C, M, Y, K, C, M`, and Y`, which are characterized by a common four-color machine that can be printed on two separate occasions. The same color ink added can make the local relative density more than 2.2. Extends the range of chromatograms. But when printing, intimate friends use transparent ink. The four-color version of the traditional four-color hard to reproduce the metal color and pearl color, high-fidelity color technology can be a good reproduction.