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In the printing of color newspapers for several years, our factory has carried out some explorations to improve the printing quality of color newspapers. At the same time, we have also accumulated a lot of experience and experience. To sum up, we have to go through several misunderstandings.
Misunderstanding 1: As long as it is not dirty, even if the ink balance has long been, our printing workers have been using monochrome offset offset printing machine to print 2 +1 sets of red newspapers, this newspaper is characterized by no color superposition, the requirements of the ink balance is not strict , generally do not get dirty in the print on it. However, for color printing, it is not enough to only make the PS version dirty, and it is also necessary to truly balance the ink and ink. The measure is that the colored ink cannot be emulsified. Otherwise, there will be color reproduction distortion, dot expansion, color is not bright, the picture lacks a sense of three-dimensional and layered and other issues, so we should first go out in the printing of newspapers as long as it is not dirty even if the error of ink balance, strictly control the color ink Emulsification to standardize printing conditions.
Misunderstanding 2: Relying on the thickness of the ink layer to solve the problem of color reproduction In monochromatic printing and 2+1 sets of red printing, the change in ink layer thickness affects only the color of each color ink. Once the hue is saturated, the color changes and the thickness of the ink layer. The relationship is not too big. Although the ink layer is thick, the visual effect is not obvious. However, the printing of color newspapers is different, because the color is achieved by superimposing dots of primary inks through dots. Therefore, the reduction of colors must be unified over the standard of saturation of primary ink hue to accurately reproduce the colors required after superposition. No matter which of the primary colors of ink ink over can seriously affect the final color reproduction effect: First, may make the primary color hue saturation changes; Second, due to the thickening of the ink layer to make the ink saturated, will make The dot enlargement may change the reduction effect of other color inks. In short, if the ink layer of ink is too thick, it will superimpose the color and make it distorted. Therefore, when printing color newspapers, it is necessary to control the ink layer thickness of each primary color ink so that the ink thickness of each color ink is reduced as much as possible while maintaining the basic saturation, so that the ink transferred to the paper exactly matches the electronic color separation. The stable parameter values ​​of the various inks given at the time, so that the printed newspapers can basically reach the effect required by computer separation.
Misunderstanding 3: The color reproduction of the photograph is based on the original script. This is what we learned from practice.
The pictures and photos in the newspapers are mostly news photos. They have particularity and fastness. Because of the limitations of their collection and many conditions, not to mention the fact that there are still some photos and pictures that are duplicated, so their levels and colors are generally not Too ideal.
It is unrealistic for the editorial department to provide perfect manuscripts to meet the printing needs. In the face of this situation, our Computer Separation Division will give full play to the role of the computer and perform adjustments and color adjustments for different originals to supplement the insufficiency of originals and improve the effect of photo-taking. Song, the output is naturally not the same as the original manuscript. Therefore, when the offset printing shop prints, it cannot completely adjust the original color according to the original color, but it should be adjusted according to the saturated color of each color or the standard color standard. It is best to give a large sample to the offset printing shop for standard drafts. It takes a certain period of time to use the PS version for proofing. To ensure the delivery time, this is not realistic. In the face of reality, we require that the offset printing shop must master the processing characteristics of the color newspaper photographs of the factory. Strictly follow the standard color marks (color marks that can reflect the saturation of each primary color) on the day newspaper in strict accordance with the computer color separation department to truly reflect the effects of computer processing. In this way, it is possible to avoid praising the actual color and the set color of the original color caused by the operator's clapping for restoring the original. Especially for those photos that have a large color cast, which do not meet the requirements of color separation and do not meet the requirements of the color reproduction process, if you simply pursue the restoration of the original, you will mess up all the basic parameters of printing...
How can I find the correct saturated color standard for each primary ink of the precedent? In a word, it should be decided according to the layout characteristics of the color newspapers printed by each manufacturer. Our approach is to make an article in each edition of the message line, making two important colors, green and red, into a ribbon in a certain proportion, which offsets the worker's color adjustments strictly in accordance with this ribbon, regardless of the original. How, as long as the ribbon is standard, the reproducibility of the general picture will be better (refer to the effect of computer color output). If it is found in the printing that the ribbon is no longer the required standard ribbon, even if the color of the printed image is the same as the original, the printer must adjust the machine to restore the ribbon to a standard color.
Myth #4: Don't pay attention to network expansion rate In monochrome printing, the expansion of network points is generally easier to control. Even if there are some network expansion points, the impact on print quality is not too great. The dot enlargement in color printing is different. The dot enlargement will cause the color reproduction to be untrue and cause color cast. In the four-color printing, if the dot enlargement rate of the four-color version is inconsistent, the photo may be color cast, and This resulted in a total loss of about 85% of outlets; if the four-color version of outlets has the same rate of expansion, and the rate of outlet expansion exceeds the general expansion criteria, then there will be no hierarchy of pictures, which is unclear. Of course, there are several factors that will cause the expansion of outlets, but the most important factor is the size of the printing industry. Once this phenomenon occurs, the operator must be adjusted in time, and the long-term stability of the dot enlargement rate of each color is controlled within an ideal range, so as to ensure the accuracy of color reduction in the printing process.
In addition, due to the enlargement of the dots in each color version, the ink layer will be thickened after stacking, which will also cause the ink layer to be difficult to dry. This will cause the final printed color paper to be pulled, scratched, and dirty, which is not only unsightly but also impossible to reflect. The picture is gorgeous and vivid.
How can we get rid of the misunderstandings of the above several color newspapers?
In my opinion, first of all, it is necessary to change the concept and thoroughly remove the bad habits that we had previously created when operating monochrome newspaper printers. We must strictly and meticulously adjust the important parameters of the offset press in place. Any change in one of the important parameters must be known, otherwise you will not be able to start with problems.
Followed by the pilot to be familiar with and understand the technical parameters of each printing process, once there is a problem, can be sure that the heart does not panic, and quickly and accurately analyze the cause of the problem, the right medicine.
Third, we must strengthen printing press training for printing press operators so that they can truly improve their understanding of color in theory and practice, truly understand and master the basic principles of color reproduction, and be familiar with the characteristics of inks and the hue and network of saturated colors. The parameters of the rate of expansion, so that a certain color can be seen to determine the proportion of the primary colors of the color.
If a press operator can do the above requirements, the thinking of the work will be clear, and the judgment will be accurate, it will be able to print high-quality color newspapers.
With the development of the economy in various regions of China and the modernization of computerized means, in recent years, newspapers in various regions have begun to print colored newspapers. In 1997, the output of color papers in our factory was only less than 10% of the total print volume. In 1998, the print volume of our color newspapers rose to over 30% of the total print volume. The amount of printing has accounted for about 40% of the total printing volume. On average, there are about 30 million copies of the daily color printing task. The coloring paper accounts for about 50% of the total amount of color printing.