How to ensure the quality of newspaper printing ? The author believes that with reference to the national standard GB/T 17934.3, combined with the actual production process of newspaper printing, the standardization, standardization and data quality control of image processing, typesetting, plate making and printing process is an effective way to improve and stabilize the quality of newspaper printing. .
Image Processing
The following key operations should be mastered when using Photoshop software for image processing.
(1) The image should be processed in the RGB color mode, which is advantageous for the image to have a larger color space and a more subtle layering effect.
(2) The color cast image should be processed using the automatic color gradation function.
(3) When the image color mode is changed from RGB to CMYK, the black ink setting is 85% to 95%, and the total ink setting is not more than 260%, regardless of the background color removal (UCR) or gray component replacement (GCR).
(4) Adjust the sharpness of the image by sharpening. It should be noted that the sharpness of the character image should be small; the landscape image can be sharpened to a greater extent, but the number of sharpening is generally not more than twice, otherwise the image hierarchy will be lost too much.
(5) The image resolution should be no less than 300dpi, and the line and text resolution should be no less than 600dpi. In order to avoid enlarging or reducing the image during layout, the image size should be the actual print size when performing image processing.
(6) The image output format is “.TIFâ€, and the image color mode is CMYK mode or grayscale mode.
(7) Selection of white and black fields. Taking a picture with a midtone and a contrast standard as an example, the original high light is defined as a net; the highlight is generally defined as C 5% to 7%, M 3% to 5%, and Y 3% to 5%. The black field defines C as 95% to 98%, M as 85% to 88%, and Y as 85% to 88%. When performing image processing, the white field and the black field can be selected according to the image contrast size, and the subject color should be as close as possible to the bright portion.
typesetting
(1) The heart and the side space. Different layouts of newspapers may be done by different typesetting staff. This requires different typesetting staff to set the size of different layouts, the core size and the edge space size of each layout must be highly consistent, otherwise it will bring unnecessary trouble to the subsequent imposition work.
(2) Font. The font color of the title of the article should be no more than two colors. The color of the font should be monochrome. To avoid the phenomenon of paste during printing, the font color and the color of the pressed shading should have a large color difference; .
(3) Image color mode. The image color mode should correspond to the printing mode, that is, the gray mode corresponds to monochrome printing, and the CMYK mode corresponds to two-color or color printing. In addition, a series of operations such as zooming in and rotating the image should be avoided during the layout process. If necessary, these operations can be done in Photoshop software.
(4) Output file name. The output file name should be "newspaper name + date + version + version", in principle, named in Chinese, which can bring convenience to the subsequent imposition and plate making work.
(5) To print a sample. The prints are usually signed by the editor, which is also the basis for printing. The printed color and precautions should be indicated on the printed samples. During the inspection, it should be determined that the date (calendar, lunar calendar), week, and edition on the printed sample are correct. Taking the open version as an example, the correction on the printed version should be less than 3, otherwise it needs to be recalibrated.
(6) Output file. The output file format is ".PS", and the output mode is "including image data". The contents of the version should be deleted.
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