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There is knowledge in the color, and the spot color distribution network does not step on the pit
Release time: 2021-11-12
There is knowledge in the color, and the spot color distribution network does not step on the pit
Autumn is getting deeper and it is time to produce agricultural boxes. The customers of the agricultural box especially like to print colorful images such as fruits and vegetables on the box label, which is both beautiful and vivid, and can know at a glance what it is for without reading the words. Usually the customer's requirements are not very high, but they must pay attention to the details. After all, the watermarks are different in color, and the parameters of the equipment limit the imagination of the product, but at least it must be like that. How to print color pictures with watermarks is a topic that each of us Jinmei often discusses. We welcome everyone to discuss and share common progress.
Recently, a customer ordered a carton of passion fruit, saying that it was made a few years ago. After research, there is a high probability that the version of the set network will be inaccurate, and a new version needs to be made. I thought it would be good to change the old documents, but after I went to the quality control to borrow the sample box, it was not fragrant in an instant: the printing of the sample was rough, and the creases were obvious. After getting in touch with the plate maker, I learned that the computer used automatic four-color screen separation before, but the layout could not be printed in standard four-color, so there was a serious color cast.
Originally, the dots were rose red and blue. Because the layout contained special red and special green content, it was printed in special color, so the printed product was reddish and yellowish. The correct approach should be to simulate the spot color and adjust the grayscale to achieve the effect as close to the original image as possible. After communication, the customer agreed to make a new version.
After the drawing is adjusted, the plate maker will make the plate, and the final effect is acceptable to the customer. Because the effect remained the same, it saved him a lot of money.
The document is divided into the network before printing, usually the computer is automatically converted to CMYK mode for publication. Even with the best imported plates, the results are sometimes unsatisfactory. CMYK four-color printing is a lithographic printing method that uses rose red, pure yellow, blue and black ink to achieve full-color reproduction according to the principle of subtractive color mixing. In theory, four-color printing can obtain thousands of colors, but due to the deformation error of "dots" in the printing process and the limitation of visual recognition threshold, four-color printing has a large hue shift on the watermarking machine and sets Position inaccuracy and so on.
The carton is also commonly used with yellow surface paper, and there is no contrast in the white background, and the pattern will look dark and not bright. The more you print, the darker the color. Therefore, we can use spot colors to replace the three primary colors, reduce the number of colors, and use complementary colors to superimpose the black effect; and for the highlights, we can reduce the collision of colors, and even leave no dots to express.
CMYK online, although loyal to the original, is not the best effect, the cost of plate making is high, the printing difficulty is high, the finished product is dark, and the color is cast. Finishing is waste), because there are obviously simpler production methods.
When the effect is similar, using the spot color to hit the screen can greatly reduce the cost of plate making and bring more competitiveness to the business to win orders. The pattern reduces the number of colors, which can reduce the difficulty of registration, so that the printing machine can save the adjustment time and improve the work efficiency.
Using the special color to hit the screen and register the color can make the printing color easier to control, and the color will not appear color cast or hue shift due to the deformation error and pressure change during the transfer process. It can reduce the influence of the nesting error on the clarity of the pattern.
As for what kind of pictures to use, it depends on the specific problem. Some pictures can only be made in CMYK, but if you find that you can use three-color printing, you will never use four-color printing. If you can use two-color printing, you will never use three-color printing. color. Today, when a penny is also love, we should pay more attention to saving.
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