"Leakage" causes and traps
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Although computerization has shortened the workflow, it has also caused a lot of problems. One of the more overlooked is the trapping. This problem has been in existence for many years. Today, when it comes to computerized production, the problem of whiteout is still very common. How serious is this problem in the process of DTP production? What is the problem of leaking white?
First of all, "leak white" is literally explained as leaking white, that is, some places where there should be no white appear white. You may wish to pay attention to some printed matter. Between the color blocks and the color blocks, there may be a very fine white line. This line is not deliberately added, but the problem of whiteout mentioned in this article. The cause of this is to start with the color separation film.
After the computer is finished, the four-color film is output. The four slices are C, M, Y, and K. The colors set on the computer are usually C, M, Y, and K. Therefore, 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 C slice of the output color separation sheet will have 100% black. The problem of whitening is generated when the color is set. For example, four closely-spaced squares are set on the computer, and the four squares are determined to be C, M, Y, and K colors. The four films output each have a square black box. The four pieces went to the printing house, and after the printing process, they were put on the printing machine, and the four colors were superimposed on the paper at a high speed. Since the paper needs to run at a high speed on the printing press, the edges of the grid and the grid cannot be closely attached to reveal the paper color. Such a white line is called "whitening". The natural need for remedy for "leakage" has led to the "trapping" work.
The trapping method starts with the computer. The easiest way is to set a frame line when setting the color and use Overprint for the frame line. With this line, even if there is a walking position during printing, there will be no white lines, only a dark line. It seems simple to trap the job, but if the color layout is complicated and complicated, there will be a mistake. In case of high demand, the color of the trapping white line is also a problem. If the blue touches the yellow and adds a line, the line is green. This effect affects the design of the layout. Don't have a green line, so there are a lot of trapping tips.
The most common trapping tips are Spread and Choke. Spread (commonly known as "food out") refers to the color version of the outward expansion trap line superimposed on the peripheral color block. The concept of Choke (commonly known as "ingestion") is the opposite of Spread, allowing the peripheral color version to expand inward. The use of two trapping techniques depends on the depth of the color, preferably by a light color overlaid on the dark. There is no absolute situation in the world. In some cases, the trapping white line may use the effect of Mixed. Mixed refers to the color of the trapping white line is the color produced by mixing the two colors on the color plate.
Usually most of the software we use (such as: PageMaker, QuarkXPress, Illustrator, FreeHand, etc.) have built-in trapping function, and these software can only do some simple color blocks and color blocks to meet the trapping work, as for Gradient colors and images all need to do the job of trapping.