Reduce the color difference of printed products
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Why is such a color difference so poor, why is it so great?
The reason is as follows
1. The digital direct printing used for proofing uses 157 grams of double copper and the document customers have already changed. Many times customers say that I am shrinking or changing files. But sometimes they do not intend to change it. Whether the new document was proofed or not was printed directly from the film. Therefore, the color difference at this time is relatively large, and it is also one of the main sources of color difference.
How to avoid it?
1, as long as the file is modified, we must proofing. If the color requirements are high, it is best to use the traditional method, what paper is used for printing, and what kind of paper is used for proofing. To achieve unity, this will block the color difference at the source. Especially new customers must do this. Digital sample is not? Row. But there is no tradition. Digital proofing must be played at the manufacturer. General manufacturers have CTP. The parameters of the digital camera and the printing press are adjusted to one, so that the type of digital printing that can be printed can reach 90% or more. Unfortunately, many CTP printers do not have the parameters adjusted to the printing press, or simply do not.
2, design problems, many designers do not understand printing or understand some of the printing, not professional, so the design of the file looks very good, it is difficult to do. For example, many designers use black to make C, M, Y, and K 100% on the ground. Overprinting and printing are used to print white paper. Is this black so good to see it printed? To increase the difficulty, such a large amount of ink, it is difficult to control. Especially for thin paper, due to the large amount of ink, it is difficult to control the balance of water and ink. Printing and paper feeding are also difficult to take and often stop. How can such colors not deviate, all the way out, all the way to color. There are flat screens that are knocked out by four colors. Only one color is not controlled, and the colors are different.
How can we avoid it?
The higher color blocks are required to be changed to spot color printing, especially large ink or flat screen color blocks. If the large amount of ink cannot be changed to spot color printing, do not make small fonts or picture lines in large blocks of color. It cannot be made into four-color printing. In short, there are some methods.
3, process according to row should be reasonable, in the row before the single, we must review the project list, the process is arranged according to good
4. The source of color difference is mainly due to the improper operation of the captain.
Now that printing presses are more and more advanced, the requirements of the captains are not as high as many previously required by the printing companies. Many captains have poor control of color. Under the premise that the ink is not balanced, printing a few sheets is close to the color sample, and all the way is opened. The result is printing all the way, adjusting the ink volume all the way, all the way to the color difference. There is no color difference.
Therefore, the chromatic aberration of printing is unavoidable, but deviation from excessive chromatic aberration can be avoided completely.
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