With the advancement of science and technology, the content of newspapers has become more and more colorful, and readers have increasingly higher quality requirements for newspapers. Newspapers must not only rely on the quality of the articles themselves and the amount of information to win the readers, but also on whose newspapers can win advertising opportunities for advertisers and win a wide range of survival under the fastest and optimal conditions. This puts forward requirements for the quality of each procedure produced in our newspapers.
Newspaper printing, like other forms of printing, has the same requirements for readers. The true degree of graphic reproduction, which is the quantitative indicator of the reader's first choice of information and the degree of eye comfort in reading the print, determines whether the reader is willing to continue to understand the information contained in the newspaper. From a professional point of view, it is the degree of loss of printing outlets, network expansion, color distortion, and overprinting that exceed the allowable range of quality. The newspaper printing has faster printing speed than other printing forms, large paper deformation coefficient, large instability of the tape in the printing process, and low overlay accuracy.
With the appearance of color newspapers, more and more people in the newspaper industry are beginning to realize that improving the quality of the prepress process is the key to improving the quality of the printed matter. Newspaper publishing is a complete system project. Controlling the quality of printed matter must control the quality of each procedure in the publishing process of newspapers. From editorial editing to printing and publishing, mutual assistance, cooperation, coordination and coherence are all needed to achieve good results. The quality of the final product will be guaranteed. This article starts from the particularity of newspaper printing and talks about the influence of prepress production on newspaper quality.
I. Editing ideas
Some editors added editorial ideas of some high-level printing methods such as commercial printing according to their own aesthetics when they edited their ideas in the newspapers. Because editorial ideas contained creative information that did not meet the printing conditions of the newspapers, the quality problems were brought into printing. For example, giving multi-color printing information on thin lines increases the difficulty of printing overprinting; creating some hollow words in the field, and the situation that the reader cannot read the information contained after printing, etc.; this often makes them The newspaper layout designed and produced has a large gap with the original intention after printing.
The newspaper media hopes that the merchants will do color advertisements, and the merchants also hope to attract readers' attention with colorful advertisement forms so as to achieve the effect of promoting the products. However, advertisers and business people lack understanding of the technical specialities of newspaper printing, use high-level printing methods such as commercial printing to design advertising ideas, use too many complex designs in creative advertising, and even put all The text descriptions all give multicolored print information. In this way, because the print accuracy of newspaper printing does not reach the advertising creative effect, there is no reading comfort in front of the reader and more attention is paid to the advertisement, which makes the advertisement less than expected.
According to the characteristics of newspaper printing equipment, the creators should understand a basic principle: the more concise it is, the better, especially the small-character text and lines should reduce multi-color printing ideas, in order to improve the perception of printing overprint. Do not leave the idea of ​​zooming in or out of the picture-independent coordinates in picture editing. This eliminates the relief of the picture.
Second, prepress production
In the field of printing, there is almost a consensus on the quality of printing: "Seven-point three-point printing" can be seen in the importance of prepress production in printing. With the advancement of science and technology, the emergence of complex pictures in newspapers is no longer a technical problem. The newspaper layout is also constantly innovating, and the layout is becoming more and more complex, and some are similar to commercial printing, but the production time It is much shorter than the original and the print quality is much higher than the original requirement. Driven by quality and timeliness, many newspaper executives are fully aware of the urgency of improving the quality of prepress production.
Analyze the newspaper quality appraisal information in recent years, the newspaper quality has the following several problems: The picture superimposition is not high in permeability, the printing ink is uneven, the large-scale whiteness and color deviation, and so on. These problems that restrict print quality are all related to prepress production.
Scanning color separation dominates the three indicators of color, tone, and sharpness of color images. Therefore, a very systematic study of color separation in the printing process plays a key role in improving the printing quality, along with scanning color separation technology. Progressively, some printing methods that cannot perform precise color printing also reproduce high quality prints. The breakthrough of computer electric carving technology in the 1990s made gravure printing a dominant position in high-grade trademark printing. Advances in computer separation technology have made flexographic printing more involved in printing and have been adopted by some newspaper printing companies. However, newspaper printing has always been considered as a printing method with lower precision requirements in the printed matter. In application theory, the application theory of other high-precision printing methods is used, which restricts the overall improvement of newspaper quality. Now the National Press Association has begun to set the industry standard for newspaper printing, which will greatly promote the improvement of newspaper quality.
The offset printing widely adopted by newspaper printing companies has its own particularity because its constituent equipment and its printing materials belong to printing methods with lower printing accuracy. For example: Newspapers are based on the printing of text printing, emphasizing the coverage of the ink, when the background color separation is removed, according to the traditional color printing operation, the definition can not be guaranteed. In addition, the paper used by newspapers is relatively rough, the printing pressure is relatively large, the ink is mainly osmotic and dry, etc., and they must be taken into account before printing.
Another important step in prepress production is the printing plate production. The printing plate is the basis of printing. If the printing plate is not made well, the printing rate will be reduced, the ink-drawing performance of the graphic and text will be reduced, the large-format graphics will be white, the color pictures will be color-shifted, and so on. Here are the responsibilities of the operators. Operational technical problems, but also the quality of the printing plate. In the traditional printing plate production, the main causes of these problems are over-exposure of the printing plate, excessive display time, high concentration of the developer solution, and inconsistency of the light transmittance of the film. The survey found that some PS plates were too thin due to the photosensitive resin, which made the printing plate more difficult. There was a big gap between the printing rate of the PS version and the theoretical index.