High-fidelity screening printing technology two

Third, high-fidelity color suitable for high-fidelity printing

Before naming high-fidelity outlets. First understand high-fidelity printing. Since existing paper and ink cannot fully reproduce the color gamut of natural color originals, in order to improve the saturation of certain colors on prints, the pure, bright red color is printed on the basis of four colors of C, M, Y, and K. Colors such as green, blue and purple can create a more natural contrast and a fresher sense of color in printed images. This type of printing is called high-fidelity printing. For example, when printing a picture of strawberries, the red and green versions can be added, so that the red color of the strawberry fruit and the green color of the green leaves appear more pure and lifelike. The whole picture appears vivid and vivid.

The dot distribution in FM screening is irregular, and the distribution of silver salt particles in photographic negatives and photos is also irregular. As long as the dots in the FM screening are small enough, the printed matter can fully approach the original and achieve high fidelity. Since the frequency modulation screen is not limited by the shallow angle of the screen and the color reproduction range is wide, it can produce special printing that can not be achieved by conventional four-color separation, and can perform multi-color printing of four colors, thereby creating a high-fidelity printing effect. High-fidelity outlets are a new software standard for FM technology. It is a pure software approach. High-fidelity color using FM network, more than four-color color separation technology, in the color reproduction range, print density, clarity and level compared with the four-color screening technology has a significant development.

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 common and practical process requirements, there are basic choices to meet the needs of most users. For example, the basic colors used in the Kupper and Linltype-He VCF color systems are C, M, Y, K, and Orange. Green, purple, and its characteristics are in the chromatogram in the coverage of the maximum expansion as the goal, taking into account the practical aspects of production; the latter chromatogram represents a larger range than the former, through the completion of the secondary scanning color separation. The basic colors used in the Pantone 6 color system are C, M, Y, K, blue, and green. The feature is to accommodate Pantone chromatography as much as possible and reproduce Ektachrome offset printing chromatography to meet the many 6-color printing presses on the market. 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 Hyper Color are C, M, Y, K, C, M`, and Y`, which are characterized by the use of an ordinary 4-color machine that can be printed in two separate steps. The same color ink added can make the local relative density exceed 2.2. , to achieve the expansion of the chromatographic range. 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.

In foreign countries, high-fidelity printing has been applied in commercial printing, and as a development direction of sheet-fed offset printing, its market prospects are promising. Such as Hexchrome high-fidelity printing is a multi-color double-sided printing process, with single-channel, multi-color printing, high profit, high production efficiency. Japan's printing technology is known for high quality and fine prints. In the field of multi-color printing, printing equipment with eight or more colors has entered the Japanese market. Most of the formats are facing, and some even reach 10 colors and 12 colors. At the same time 8-color A2 format, 6-color A3 format printing presses have also landed on the market. In addition, five-color double-sided printing presses also appeared in commercial printing, but from the perspective of cost savings, product development will focus on web printing presses.

The use of high-fidelity printing increases the production costs and the technical requirements for the production process are also high. For example, using more plates and inks costs more than four-color printing. In addition, there are also some factors that limit high-fidelity printing to replace the traditional four-color printing, such as the widespread use of multi-color printing presses, the need to add films, plates, proofs and ink costs and so on. In addition, the problem of creating effective color separations and combining high fidelity pages is also an important factor limiting the popularity of technology. The use of high-fidelity technology requires the addition of color separation software. High-fidelity technology also increases the requirements for printing machines, generally requiring more printing units or requiring multiple printing on the machine.

At present, high-fidelity printing is still at the research and experimental stage in China, and it is not widely used in commercial printing. However, this does not mean that there is no market for high-fidelity printing. With the continuous improvement of people's requirements for printing quality, high-fidelity printing technology with added value will surely become practical and commercialized, bringing benefits to printing companies. From the current market, there are a large number of prints suitable for high-fidelity printing. For example, high-fidelity printing of high-fidelity printing of famous paintings with high requirements for printing quality and reduction effect can restore the effect of famous paintings in a true and clear manner and prevent their appearance and color. Distortion, maintain color and artistic charm, enhance appreciation and collection value. For high-fidelity printing for advertising commercial printing etc., it will leave a deeper impression on people and improve publicity. For printed materials that require high quality and can be enjoyed for a long period of time, as well as the printing of packaging and decoration materials for goods, there is a great demand for high-fidelity printing.