Former newspaper printing tends to attract readers and advertisers with color, and single-sided color and double-sided color printing are thus widely used. How to print high-quality colors in newspapers? In addition to cracking paper, ink and printing machine problems, digital processing of pre-press graphics is essential.
Newspaper printing is different from traditional commercial printing. Newspaper printing substrates are newsprints. Most of them use high-speed round transfer machines. The expansion of outlets and the expansion of paper are fundamentally different from commercial printing. Therefore, in printing front-end images and layout, To adjust to suit the printing requirements.
1. Image adjustment color mode
In order to restore the true color and richness of the image as much as possible, the image color must be adjusted in RGB color mode. When using Photoshop to process images, the effect of selecting RGB mode is better than selecting CMYK mode. Processed in RGB mode, then converted to CMYK mode. When scanning with Photoshop, simply select the RGB setting option in the color setting options, and the color image input through the scanner is RGB mode. Because the color gamut of the RGB mode is much larger than the color gamut of the CMYK mode, the color information can be fully reflected. Processing the image in the RGB mode will result in a wider color space and more processing effects.
2. Adjustment of clarity
The printability of newsprint determines that the number of hanging lines in a color newspaper cannot be too high, generally about 90 lines to 110 lines, so sharpening is needed to improve image sharpness when adjusting images. The degree of sharpening is related to the type of the original image and the zoom ratio. Usually, the sharpness of the image of the character is smaller, and the landscape draft can be larger; the larger the image, the greater the sharpness; the higher the magnification, the sharpening degree The deeper it is.
3. Level adjustment
The purpose of the level adjustment is first to meet the printing requirements, and to compensate for the increase of the dot according to the characteristics of the high rate of increase in the printing dot of the newspaper, and to concentrate the main layer in the middle zone, that is, 20% to 60% of the visually sensitive zone. The tone of the original is maximized to correspond to the tone that can be reproduced by the print to make the image clear and true. Secondly, according to the original content and the hierarchical distribution, the accuracy of the important part of the tone is guaranteed. For example, the face of the person must be clear in level, and the value of extremely high light or extremely dark tone should be adjusted.
4. Mode conversion
The image mode used for printing must be in CMYK mode. Pay attention to the color separation setting options in the image processing software. Setting this parameter correctly is critical to obtaining a qualified print color. The dot size is increased to about 30%, the total ink volume is 220% to 260%, the GCR is used, the black version is the middle adjustment, the black version is 30% or more, and the black version is the maximum limit of 85%.
5. Adjust image size
During the grouping process, don't zoom in or out at any time in the group software. This will lose a lot of image information, causing the printed image to be imaginary or dark. If you must change the image size, you should go back to the image processing software for editing. This will maximize the image information.
6. Small font processing
The printing speed of newspapers is fast, the expansion rate of outlets is large, and there is no high imprinting precision as in commercial printing. If multi-color small fonts are used in layout design, it is easy to produce fonts. Because of the inaccuracy of overprinting, the fonts are blurred and have ghost images. Use a small white word on the overprinted image.
7. Group layout color
The color should be dominated by bright tones.
Newsprint is uncoated, with a base color, and the bright color is good for giving the layout a bright feeling. The color is saturated. The newsprint is rough, the mesh used for printing is thick, and the saturated hue is more conspicuous.
Now many newspapers have purchased a digital proofing system. This system generally uses the internationally accepted ICC method for color correction. The color conversion fully takes into account the color gamut of newspaper printing. Combined with the characteristics of newspaper printing, the color, level details, and brightness of printed color samples are guaranteed. The comparison is highly consistent with the final printed newspaper. After adjusting the image group version, this detection method can be used to improve the quality of the image and the layout of the entire newspaper, and in particular, the printing effect of the advertisement picture can be predicted.
Of course, plate making is also an important factor affecting the quality of newspaper printing. Now the newspaper version is generally divided into two processes. One is to output the film sheet after the film is output for the photo machine. We must strictly control several important data using this process. The solid density value of the color separation sheet should be above 3.2, and the fog of the base (including the superposition of the multilayer substrate) should be less than 0.15. The linearity error should be plus or minus 1%.
To ensure the quality of the output film, each time a new film is replaced or the developer fixer is replaced, the RIP software must be curtailed to ensure that the data and output film are consistent. Regular maintenance of the machine, especially the filming machine, is also very important. The printing plate can be conditionally added with information strips to enhance the stability of the printing process.
Another process is computer-to-plate. It breaks through the limitations of the traditional plate-making process through the laser photo-distribution film and the artificial imposition and printing process. It avoids the variation of the printing time in the printing process, the variation of the dot, the inconsistency of the dot and the hand-stitching. Errors and errors caused by printing.
The color newspaper needs higher overprint precision, fast plate making speed, shorter printing time, and longer newspaper news deadlines. Therefore, this technology has been rapidly popularized in various newspapers. This plate-making process has few uncertain factors, and it has truly realized dataization and standardization in the plate-making process.
In the production process, we should pay attention to the output linearity of the plate making machine, ensure the percentage of the outlets, and correctly control the temperature and replenishment of the printing solution. The direct plate making system is an all-digital operation plate-making process consisting of digital workflow, direct plate making machine, digital proofing, and fully automatic bending machine. The introduction of this technology has promoted the quality standardization and data control of newspaper printing. .
In short, to ensure the quality of newspaper printing, we must grasp the quality of the original image, and ensure the quality of the plate making, from front-end processing to final printing to achieve data and standardization.
Former newspaper printing tends to attract readers and advertisers with color, and single-sided color and double-sided color printing are thus widely used. How to print high-quality colors in newspapers? In addition to cracking paper, ink and printing machine problems, digital processing of pre-press graphics is essential.
Newspaper printing is different from traditional commercial printing. Newspaper printing substrates are newsprints. Most of them use high-speed round transfer machines. The expansion of outlets and the expansion of paper are fundamentally different from commercial printing. Therefore, in printing front-end images and layout, To adjust to suit the printing requirements.
1. Image adjustment color mode
In order to restore the true color and richness of the image as much as possible, the image color must be adjusted in RGB color mode. When using Photoshop to process images, the effect of selecting RGB mode is better than selecting CMYK mode. Processed in RGB mode, then converted to CMYK mode. When scanning with Photoshop, simply select the RGB setting option in the color setting options, and the color image input through the scanner is RGB mode. Because the color gamut of the RGB mode is much larger than the color gamut of the CMYK mode, the color information can be fully reflected. Processing the image in the RGB mode will result in a wider color space and more processing effects.
2. Adjustment of clarity
The printability of newsprint determines that the number of hanging lines in a color newspaper cannot be too high, generally about 90 lines to 110 lines, so sharpening is needed to improve image sharpness when adjusting images. The degree of sharpening is related to the type of the original image and the zoom ratio. Usually, the sharpness of the image of the character is smaller, and the landscape draft can be larger; the larger the image, the greater the sharpness; the higher the magnification, the sharpening degree The deeper it is.
3. Level adjustment
The purpose of the level adjustment is first to meet the printing requirements, and to compensate for the increase of the dot according to the characteristics of the high rate of increase in the printing dot of the newspaper, and to concentrate the main layer in the middle zone, that is, 20% to 60% of the visually sensitive zone. The tone of the original is maximized to correspond to the tone that can be reproduced by the print to make the image clear and true. Secondly, according to the original content and the hierarchical distribution, the accuracy of the important part of the tone is guaranteed. For example, the face of the person must be clear in level, and the value of extremely high light or extremely dark tone should be adjusted.
4. Mode conversion
The image mode used for printing must be in CMYK mode. Pay attention to the color separation setting options in the image processing software. Setting this parameter correctly is critical to obtaining a qualified print color. The dot size is increased to about 30%, the total ink volume is 220% to 260%, the GCR is used, the black version is the middle adjustment, the black version is 30% or more, and the black version is the maximum limit of 85%.
5. Adjust image size
During the grouping process, don't zoom in or out at any time in the group software. This will lose a lot of image information, causing the printed image to be imaginary or dark. If you must change the image size, you should go back to the image processing software for editing. This will maximize the image information.
6. Small font processing
The printing speed of newspapers is fast, the expansion rate of outlets is large, and there is no high imprinting precision as in commercial printing. If multi-color small fonts are used in layout design, it is easy to produce fonts. Because of the inaccuracy of overprinting, the fonts are blurred and have ghost images. Use a small white word on the overprinted image.
7. Group layout color
The color should be dominated by bright tones.
Newsprint is uncoated, with a base color, and the bright color is good for giving the layout a bright feeling. The color is saturated. The newsprint is rough, the mesh used for printing is thick, and the saturated hue is more conspicuous.
Now many newspapers have purchased a digital proofing system. This system generally uses the internationally accepted ICC method for color correction. The color conversion fully takes into account the color gamut of newspaper printing. Combined with the characteristics of newspaper printing, the color, level details, and brightness of printed color samples are guaranteed. The comparison is highly consistent with the final printed newspaper. After adjusting the image group version, this detection method can be used to improve the quality of the image and the layout of the entire newspaper, and in particular, the printing effect of the advertisement picture can be predicted.
Of course, plate making is also an important factor affecting the quality of newspaper printing. Now the newspaper version is generally divided into two processes. One is to output the film sheet after the film is output for the photo machine. We must strictly control several important data using this process. The solid density value of the color separation sheet should be above 3.2, and the fog of the base (including the superposition of the multilayer substrate) should be less than 0.15. The linearity error should be plus or minus 1%.
To ensure the quality of the output film, each time a new film is replaced or the developer fixer is replaced, the RIP software must be curtailed to ensure that the data and output film are consistent. Regular maintenance of the machine, especially the filming machine, is also very important. The printing plate can be conditionally added with information strips to enhance the stability of the printing process.
Another process is computer-to-plate. It breaks through the limitations of the traditional plate-making process through the laser photo-distribution film and the artificial imposition and printing process. It avoids the variation of the printing time in the printing process, the variation of the dot, the inconsistency of the dot and the hand-stitching. Errors and errors caused by printing.
The color newspaper needs higher overprint precision, fast plate making speed, shorter printing time, and longer newspaper news deadlines. Therefore, this technology has been rapidly popularized in various newspapers. This plate-making process has few uncertain factors, and it has truly realized dataization and standardization in the plate-making process.
In the production process, we should pay attention to the output linearity of the plate making machine, ensure the percentage of the outlets, and correctly control the temperature and replenishment of the printing solution. The direct plate making system is an all-digital operation plate-making process consisting of digital workflow, direct plate making machine, digital proofing, and fully automatic bending machine. The introduction of this technology has promoted the quality standardization and data control of newspaper printing. .
In short, to ensure the quality of newspaper printing, we must grasp the quality of the original image, and ensure the quality of the plate making, from front-end processing to final printing to achieve data and standardization.
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