Printing knowledge-printing color and pre-press design experience

Printed matter adorns people's lives and adds splendid colors to people's lives. So what are the characteristics of qualified printed matter? What problems should be paid attention to in the printing process? Below are some of the more difficult to print colors and some design experience before printing. Let’s take a look.

  1. Gray balance. According to the experience of theory and production practice, the most difficult to control color of printed matter is gray balance. Gray balance means that the three primary colors of yellow, magenta, and cyan are combined and overprinted from light to dark according to a certain dot ratio to obtain achromatic achromatic (white, light gray, gray, dark gray, black) with different brightness under a certain printability. Obtaining a visually neutral gray color has many factors that affect it. The amount of ink used in printing, paper, full-page density, dot area, overprinting, and number of screen lines will all have inexhaustible effects on the gray balance. It is the most test of the overprinting accuracy of the machine and the skill level of the operator.

  2, 4-color screen and 3-color screen, do not print in full color (spot color printing is recommended).

  3. People who don’t know how to print are the most difficult to print. Color is one aspect, too much multi-color extremely thin lines, extremely small characters transparent white and so on.

  4, C=50M=50Y=50K=50 large flat screen, if there is a little inaccuracy, the color will be serious.

  5. The text is four-color, that is, there are text in the four colors of cmyk, especially the very small characters, which are difficult to put on, and the machine's gripping teeth are extremely demanding. This is also a relatively common problem, so the pre-press designer must check whether the black text in the publication file, especially the small print, is only on the black plate, and should not appear on the other three-color plates. If it appears, the quality of the printed product will be greatly reduced. When the RGB graphics are converted to CMYK graphics, the black text will definitely become four-color black. Unless otherwise specified, it must be dealt with.

  6, and even the black background is not easy to handle. In order to achieve the effect, the black background can be printed with special black ink or printed twice. It is not difficult to print, and it is more labor-intensive.

  7. Superposition of several color dots, especially more than 70% dots. Specifically, dark brown, coffee, dark green (flat screen, containing blue 70), dark blue, purple blue, etc. are difficult to print because of the color difference, and it is not easy to find a balance on the printing machine.

8. In printing, things that are generally full-page, full-page or large-area spot colors, reversed white characters, the same logo, and the same color block are generally difficult to follow the color, and are prone to color difference, ghosting, smearing, and scratching. Injury phenomenon.

In short, qualified printed matter must meet the following requirements: 1. Accurate overprinting; 2. Even ink color; 3. Full dots; 4. Ink balance; 5. No printing faults, such as smearing, scratching, patterning, and paste printing, etc.; 6. , Strictly loyal to the original manuscript. Printing companies must pursue high-quality printed materials to adapt to people's rising aesthetic concepts.