How to restore the color and level of pictures in the printing of color newspapers

In the printing process of color newspapers, there are many factors that affect the quality of color newspapers, mainly including the color and gradation of pictures, ink color, layout, registration, water and ink balance, and equipment status. In actual production, we mainly control from the following 5 aspects.

The restoration of the color and level of the picture is mainly related to the two processes of scanning and printing. When scanning, first classify the original documents (divided into fax pictures, photos, and secondary original documents). Scan the fax pictures and original photos with the proper number of lines after aligning the scanner lens. Pay attention to 4 points when processing the scanned pictures:

1. Make sure that the highlight part of the picture is not on the Internet;

2. Ensure that the dark-tone parts of the picture are not at different levels;

3. As far as possible to ensure that the middle tone has rich levels and moderate brightness;

4. When removing the background color, make sure that the four colors of the dark part of the picture do not exceed 260% to 280% after being superimposed. For the secondary manuscript, in order to prevent the phenomenon of "moire" in the printing process, the scanner lens should be properly blurred before scanning or after scanning, the image of the scanned secondary manuscript should be properly decontaminated to increase Scanning accuracy or angle rotation is less than 15 °, focus adjustment on a certain point. In these processes, the scanners adjust the R, G, and B parameters of each picture based on their own experience and the conditions of the newspaper ’s printing equipment to determine their processing effects.

For the production of newspaper eyebrows, take "Xinhua Daily" as an example. "Xinhua Daily" has a total of 16 editions of color newspapers A, B, C, and D every day, and there is a standard color bar with four colors superimposed under each layout. The production of color bars includes two aspects:

1. 100% outlets mainly test hue and density;

2. 30%, 50%, 70% dots mainly measure the increase rate of printing dots. We make this standard color bar with the following three functions.

â‘ In theory, as long as the printing ink color staff adjusts the color bar of the day to be close to the standard color bar, the amount of ink in each color of the photo on the color bar is basically in place.

â‘¡ When adjusting the exposure time and developer concentration, the printing personnel can determine the exposure time and developer concentration according to the fact that the dots of 3% to 4% of the highlights in the color bar are aligned.

â‘¢Scanners can compare the difference between the effect of the picture above the color bar and the original according to the sample report of the day when the color bar is adjusted to the standard color, and reflect on the R, G, and Whether there is any need for further improvement in the B parameter, this can provide empirical data for scanning similar pictures in the future.

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