Although computerization has shortened the work process, it has also caused many problems. One of the more overlooked is the trap. This problem has existed since the time the manuscript was written. Today, when stepping into computerized production, the leak problem is still very common. How serious is this problem in the process of DTP production? What is the problem with leaks?
First of all, "leak white" literally means that white is leaked, that is, white should appear in some places where there should be no white. You may wish to pay attention to some printed products. There may be a very thin white line between the color blocks. This line is not intentionally added, but it is the white leakage problem mentioned in this article. The cause of the problem is to start with the color separation film.
After the computer completes the production, it outputs four-color films. The four films are C, M, Y, and K. The colors set on the computer are mainly C, M, Y, and K, so The color setting on the computer determines the image distribution of the output film. For example, if C is set to 100% on the computer, the output of the color separation film will have 100% black on the C film. The problem of leaking occurs when the color is set, such as setting four close squares on the computer, and the four squares are set to the colors of C, M, Y, and K. Each of the four films output has a square black grid. The four films arrived at the printing house, and after the process of printing, they were put on the printing machine, and the four colors were printed on the paper at high speed. Because the paper needs to run at high speed on the printing press, the color of the paper will be revealed if the edges of the grid cannot be close to each other. Such a white line is called "leakage". There is a natural need to remedy "leakage", so there is a work to "make up the leak".
The trap first starts with the computer. The easiest way is to set an extra outline when setting the color, and select Overprint for the outline. With this line, even if there is a position when printing, there will not be a white line, only a dark line. The trapping job may seem simple, but if there are many and complex color layouts, there will be mistakes. In the case of demanding customers, the color of the trap line is also a delicate problem. If blue touches yellow and then a line is added, the line is green. This effect affects the design of the layout. Don't show the green line, so there are many trapping techniques.
The most common trapping techniques are Spread and Choke. Spread (commonly known as "eating out") refers to the color plate extending outward to fill the trapping white line on the peripheral face. The concept of Choke (commonly known as "food intake") is the opposite of Spread, allowing peripheral color plates to extend trapping inwards. The use of the two trapping techniques depends on the color depth, and it is best to overprint the light color on the dark color. There are no absolute circumstances. In some cases, the trapping line may use the effect of Mixed. Mixed refers to the color of the trapping line is the color produced by mixing two colors on the meeting color version.
Usually most of the software we use (such as: PageMaker, QuarkXPress, Illustrator, FreeHand, etc.) have built-in trap function, and these software can only do some trapping work where simple color blocks meet color blocks. Both gradient colors and images need to be trapped.
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