PackEdge: Effective Automatic Trap Handling Tool (Part 2)

As shown in the trapping process shown in Figure 3a, when the yellow ellipse objects extend into the magenta rounded rectangle in the magenta rectangular base, the trapezoidal fillet width extends to the magenta bottom. The yellow color enters the cyan rounded rectangle object or the extended cyan color enters the yellow ellipse object, which instead creates an extra green color. These special places can be seen everywhere in the design drafts. It is very inconvenient to find them by artificial 10,000. When encountering a similar situation, it is usually only possible to set the trap width to be as small as possible, resulting in the occurrence of a leak in the printing process, which is more pronounced in the flexographic printing. In PackEdge software, the above problems can be easily solved by setting the Truncate option in Figure 3.

On Edge is the default setting. As shown in Figure 3b, even if the original trap width value of Liu Xiang is set. If you are too big, the trapping width of a special place will automatically be limited to the border of the background. 3s does not happen. If set to On Center, as shown in Figure 3c, the trap width values ​​in these special places are automatically adjusted to half of the boundary (center). The set width value is correct;

(3) Setting of the Corners option

As shown in Fig. 4c, when trapping occurs at the corners, the extended yellow and cyan colors form a green color. Sometimes, the angle is too small and the extension is too much, which affects the original effect of the pattern. Different trapping settings must be set for different angle situations Sometimes Liu Xiang's perspective changes. But forgot to reset or modify the product to cause it to be scrapped. And in PackEdge. However, these problems can be easily solved through the Corners option settings.

When selecting the Round option. The trapping at the corners as shown in Fig. 4a always becomes an arc. This way, the size of the angle of view will not cause the green formed by the trapping to extend too long; when set to the Beve ed option, as shown in Figure 4b, the trapping at the corners will be cut off to prevent trapping at the corners from spreading. Too long. The Mitered option is more flexible because you can set the value of the Miter ratio, which is the ramp limit value. Miter raI,. When the value is 1, the result is the same as when selecting Beve ed, regardless of the size of the angle beveled; Miter ratio. Larger values ​​allow smaller angles to remain sharply angled without being slanted closed: the smaller the value of the Miter's ratio, the greater the extension at the angle is also slanted off. As shown in Fig. 4d, when the Miter rato value is 3, the trapezoids of the upper left corner and the lower left corner (right angle) of the triangle are sharp corners, while the solid angle in the lower right corner is smaller than the Miiler rat. Limitation of the value So we did a mitre processing. But when Miter rat. When the value is 4, as shown in Figure 4c, the angle in the lower right corner has not changed. But with Miter rat. The limit value corresponding to the value is not too small, and the solid still retains the shape of the sharp corners.

in fact. Many of the efficient and flexible trapping features in PackEdge are not covered here.

(B) Looking forward to the improvement of new functions

should say. The trapping function of PackEdge is already quite strong and can basically meet various common needs in production. As people's quality requirements for products become higher and higher, sometimes. Because the trapping of the two colors is very special, the color of the trap is too dark or the contrast is too large (as shown in Figure 59). The original trapping process is not appropriate. At this time, when we are performing trapping, we should do a gradual change to the two color traps (as shown in Figure 5b). When the overprints are not allowed to leave each other slightly, as shown in Figure 5d, the white leak will not Obviously, when overprinting is accurate or inaccurate and overlaps each other (as shown in Figure 5c), the color contrast of the overlapped portion will not be too great.

In addition, as shown in Fig. 6, when trapping the inverted text in a dark background, the edge of the trapping should also be processed in a gradual manner, so that no matter whether or not the overlay is accurate, no obvious contrast will be produced. .

It is hoped that software will improve in this area in the near future.

Source: "Printing Technology" 2005, 10 (Packing and Decoration Printing)