1 color newspaper pictures have color and level is a good reduction

The quality of a color newspaper depends largely on the quality of the color picture. The newspaper used a picture of a wide range of sources, Xinhua news agency, the indoor pictures more easily partial color, online picture and television picture collection accuracy, image quality vary, to achieve good effect in scanning technology has become a key factor. First of all, before the scan to adjust the parameters of Photoshop, calibration screen (RGB devices), make it as close as possible to the actual printing and a picture, according to the display and light field to set parameter was: gray coefficient 1.8, white 5500 degrees (D55), three Trinitron. Ink settings for the use of RGB scanned pictures converted to CMYK color saturation and distortion played a role in Guan Jian. Ink set (CMYK device): dot gain standard 32% (newspaper), color type GCR, black ink volume 100%, number 0% UCA.

At the time we have to make sure this picture of the black field and fold field newspaper pictures to general news pictures, news pictures and the main characters, so the handling of character color directly affect the picture quality of the color the myriads of changes, but also have certain rules, are Asian the skin color is yellow, so Asian skin yellow magenta 5%-10%. The proportion of black parts black picture of the best than the other three, most places black best is greater than 85%, this figure is not printed in black Fanqing red. The white part of the figure can be transferred into the local net, such a picture seems to have the spirit, does not give the feeling of gray.

Sharpening the image is also very important, we choose USM sharpening, sharpening parameters generally choose: number 100% ~ 200%, radius of 1 ~ 2 pixels, net value of color price. If there is a manuscript is a two release, due to the two release itself has outlets, so we deal when you need to go to outlets, first with the wire drawing method, wire drawing method can not completely remove the network by using fuzzy method.

Make daily eyebrow, A, B, C a total of 10 pages of Xinhua Daily every day, except A1, B1, C1, other pages above have a gradient color bar. The stripe is composed of 100% green and magenta gradient gradient of 50%. We make the standard color effect have the following three aspects: 1. Theoretically, the printing ink on the workers as long as the day of the bars to close to the standard color, while color photos below desired cyan, magenta ink is already in place, then the main color photos can be determined, then yellow to photos could be appropriate to. The staff in the print to adjust the exposure time and developering concentration can according to the high 3% ~ part of the color in 5% outlets here to determine the exposure time and the developer concentration. The scanning personnel can according to the difference in color will be transferred to the printing color close to the standard sample papers to compare between the effect and the original color in the figure below, and reflect on their own existence need further improvement in the treatment of R, G, B curve parameters of this graph, it can be for the future in scanning to provide reference for similar pictures.

The text of the 2 color newspaper is inking uniform layout lithography

To ensure that the color of the newspaper part of the ink uniform, flat layout, we require the operator from the following three aspects: to ensure that the film in the exposure text clear, uniform density. In the plate making, to ensure that the PS version after exposure after the development of clear text, uniform density, flat layout. For in print, due to the exposure of suction is not good, or a dirty paper adsorption in Taiwan by the prepared PS version will not pass heavy sun. In the printing process, first ensure that the cylinder pressure is uniform, the blanket of good elasticity, and requires a moderate amount of ink, ensure that the newspaper text printed 1.8 to 2.2 density, solid density more than 3.

3 color newspaper sets of quasi whether to reach the specified accuracy

There are many factors affecting color newspaper registration accuracy: the film itself, imposition, punching, bending, print edition, edition, printing machine and so on. Considering the above factors, the quasi error is less than 0.1 mm set we require a good fight film, and registration accuracy finally printed newspapers keep at most about 1 lines, no more than 2 lines of more than 2 lines of the newspaper as processing waste newspaper.

4 color newspaper in the printing process ink balance is reached the best state

To maintain the best ink balance is the key to India I reported in newspaper printing process, which can make the printed newspaper color bright color, good gloss, easy to achieve the most beautiful water and ink printed at least the color newspaper. On the contrary if you ignore this problem, no restrictions on the content of printing process will caused great harm, such as causing the ink emulsification, the printed newspaper headlines in gray, dark photos, graphics and text without light; too much water will make the ink viscosity decreased rapidly, producing dirty float or ink block was removed into the bucket. Then reflux into the water tank for a long time, appear floc ink particles in a water tank.