At present, most county-level and municipal-level newspapers are mainly published in four editions and four editions, with a circulation of about 20,000 copies. Sometimes, a small number of color newspapers need to be printed at a large newspaper office. However, the same printing presses are processed with the same software, and the printing quality of small color newspapers is good and time lag, which is far from the hundreds of thousands of printed color newspapers. The main reason is that the normal running speed of the paper belt of the high-speed rotary machine is 9 to 13 meters per second, and the number of small color newspapers is usually only about 10,000 copies, and the color is printed before the color is optimized.
To solve this problem, on the one hand, the machine staff must be accurate and quick in color adjustment; on the other hand, the typesetting staff should cooperate as much as possible in the pre-press processing process of the small color newspaper, so that the color adjustment during printing becomes relatively It's easier to speed up the color adjustment when printing small color newspapers.
The pre-press processing of the color newspaper includes image processing, group edition, output, plate making and other processes. Let's talk about some ideas about improving the printing quality of the small color newspaper through the adjustment of image processing and group edition.
Image color and gradation adjustment
The image plays a very important role in the color newspaper. In the color newspaper printing, the image quality is good, and the color adjustment time can be reduced during printing.
1. Process color images in RGB mode
The RGB mode is a color method used by devices based on optical principles. It can express more colors, especially bright and bright colors.
The image editing process often goes through many steps. For example, if you want to combine the contents of several images, since the original tone of each component cannot be the same, you need to adjust them. No matter what effect the image processing needs to achieve, the operator wants to make the picture as real and rich as possible. Because the color range of RGB mode is much larger than that of CMYK mode, when processing images in RGB mode, you will get a wider color space and more variable editing effects. Although it must eventually be converted to CMYK, and there will definitely be color loss, it is always better than losing the image color from the beginning.
2. Image sharpness adjustment
Compared with high-end printing, due to limited printing materials and conditions, the number of image screen lines is low, and the increase rate of printed dots is high. Therefore, in the adjustment of small color newspaper images, a larger sharpening value is needed to improve image clarity .
From the screening process, sharpening has the effect of eliminating the layer loss due to screening. Therefore, sharpening is a necessary step in pre-press processing. The degree of sharpening is related to the type of the original image and the zoom ratio. Generally, the sharpness of the person image is smaller, but the landscape draft can be larger; the larger the image, the greater the sharpness; the higher the magnification, the sharpness The deeper it is.
3. Image level adjustment
The purpose of the level adjustment is to meet the printing requirements first, according to the characteristics of the newspaper printing dot increase rate, compensate for the increase of dots, and concentrate the main level in the middle area, that is, 20% to 60% of the visually sensitive area, so that The tone of the original corresponds to the tone that can be reproduced to the maximum extent to make the image clear and true. Secondly, according to the content of the manuscript and the distribution of levels, ensure the accuracy of the tone of important parts. For example, the clothes and faces of the characters must be clear, and the difference in facial levels should not be less than 15%. In addition, adjust the value of extremely high light or extremely dark tone, can't cut off the screen on a large area, and the tone of the image dot is generally controlled between 2% and 95%.
4. Image color adjustment
The adjustment of image color, also called color correction, mainly reproduces the color reflected by the original, not the color of the original. During the adjustment process, it is mainly to correct the color deviation caused by the original or scanning to ensure the accuracy of the color of the main body; also to ensure that the screen effect and the final printing effect are compatible.
Note that newsprint has a gray scale of 3% to 5%, it is best to compare the proofing proofs or standard prints, open the original digital file, and compare the colors. At the same time, the color adjustment should be based on the data displayed on the information board, not just the screen display effect.
5. Convert RGB mode to CMYK mode
The image used to print the film must be in CMYK mode, so the image mode must be converted before the film is printed. The image in CMYK mode is not as bright as the image in RGB mode. After conversion, you should check the image to make sure that there is no color cast before output. If you are not satisfied, you should cancel the color mode conversion immediately, and avoid converting it back to RGB color mode, otherwise it will cause color loss.
Group adjustment
The grouping process is also an important aspect that affects the quality of the color newsletter. The use of the color of the layout will affect the positioning, theme and style of the entire layout. Therefore, the typesetting personnel must use colors reasonably and make appropriate adjustments, so as to reduce the time for adjusting colors during printing and improve the printing quality of small color newspapers.
1. Image resizing
In the process of assembling, the influence of image quality cannot be ignored. First of all, in the group version, do not enlarge or reduce the image in the group version software. Shrinking the image will make the effect worse, and the output will be slow; while enlarging the image will have a greater impact on the image effect, if you must change the size, you should do it in the image processing software.
Secondly, we must pay attention to the problem of embossing the image, which can't be too much; don't use negative characters, otherwise it will affect the image effect.
Third, keep a certain distance between text and images, and do not over-crowd or loose, so as not to affect the overall effect of graphics.
2. The processing technique of shading in the layout
Correct use of shading to make it a part of the layout language is an important part of printing small color newspapers.
(1) Shading color selection should be reasonable
If you must use yellow shading, it is best to use 100% pure yellow, because yellow is not easy to see on white newsprint, and it is difficult to have high printing quality; if there are black characters in the shading, and the black characters do not have borders, It is necessary to use purple, cyan, green, red and other shading, because they are less visible with black characters, and they should be avoided in combination.
(2) Shading colors mostly use sub-solid colors, solid colors, and rarely use multiple colors
Because the multiple colors are overprinted with multiple colors, it will inevitably increase the difficulty of catching colors in the printing of small color newspapers, making the colors difficult to print accurately and prone to color shifts.
(3) Avoid printing color blocks on the text
Especially in small size, it is easier to reduce the visibility of the text. The background color of the text should be based on the premise that it does not hinder reading, so for small text with a certain length, it is appropriate to use a soft and light tone background, and avoid the use of dark shades such as blue green, blue and purple.
3. Processing method of layout text
Under normal circumstances, the main body of the color newspaper is black, because black is the most visible on white newsprint, and has the least visual stimulation to the reader, which can reduce reading fatigue. If the text content must be in color, it is generally appropriate to use purple, cyan and other colors with high visibility on newsprint, and rarely use colors with low visibility such as gray and red. Basically, yellow cannot be used.
The size of the article title is usually large, and the number of words is small. You can use high-clarity, high-purity colors such as yellow, red, orange, etc. to attract readers' attention and make the layout jump. At the same time, it is easy to print from a printing perspective Out effect. Of course, for the overall needs of the layout, you can also use some soft and light tones.
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