Common shading anti-counterfeiting technology for bill printing

1. Ordinary shading

Common shading generally includes ground patterns, ball flowers and lace.

The ground pattern refers to the patterns that are placed on the bottom layer of the printed content and are used purely as a background. It is a repeated pattern formed by repeated changes of line elements. In the printing of bills, it is always achieved by printing the first set of color sequences on the front side. The characteristic of the ground pattern is that it is rich in variability. It uses some very thin and light lines to form a layer of elegant base map. Tuanhua is based on the various shapes of flowers. With the density, thickness, curvature and color of the lines, it is appropriately deformed and exaggerated to form a flower shape with clear layers, beautiful lines and smooth contours Graphics. The group flower effect can be used alone or combined with other effects to produce excellent visual effects. Lace is a hollow frame figure formed by continuous replication of one or several line elements. There are fully enclosed and semi-enclosed, with single-layer lace and double-layer lace. Due to the characteristics of the frame shape of the lace itself, it often does not overlap with other printed content, so its color can be slightly brighter, which plays a role of peripheral decoration in bill printing.

When designing the above-mentioned shading, the thickness of the lines and the spacing of the lines can be changed at any time, so the designed graphics are also sparse or dense, which changes from time to time. Its anti-counterfeiting role in bill printing is mainly reflected in the complexity of the pattern and the anti-copy function.

2. Relief

Use line and ground pattern as the base, and combine with text or logo pictures to carry out the relief effect of the pattern design operation. When designing this effect, it must be composed of two parts: the shading and the picture. The picture is used to make the concave and convex graphics , And before using it, first convert the continuously adjusted pictures into line graphics. Its design principle is that there is a difference in the thickness and density of the lines of the shading part and the picture part. When the two groups of graphics are combined together, the two parts of the pattern seem to be located on different levels visually, where the picture content is uneven Sense, producing an embossed effect.

When making the relief effect, you can arbitrarily choose the picture material according to the actual needs of the bill, that is, the concave and convex content can be varied to produce an interesting and vivid picture effect. For example, a "ten" relief can be designed on the bills used by medical institutions, and a "SW" relief can be made on tax bills. If it is a zoo ticket, animal shapes can be used. In this way, the bill not only has an excellent anti-counterfeiting effect, but also has a sign function.

3. Microfilming

Miniaturization is to reduce the text to a degree that is invisible to the naked eye, and connect these reduced text into lines or form a graphic effect. It is required that the height of the Chinese text is less than 0.22mm after the reduction, and the height of the English text is less than 0.2mm after the reduction. The lines formed by microtext can also form various patterns, and have a good anti-counterfeiting function. The design feature of miniaturization is to replace lines with words, combined with other functions of shading design, can generate many changes. These micro-lines are generally composed of texts with specific meanings. Sometimes it is necessary to use a magnifying glass to see these texts. This anti-counterfeiting method is very common in bill printing. Generally, in the scratch-off tax invoices of various places, there is a micro line under the three words "scratch-off area". For example, on the scratch-off tax invoice of Gansu Province in 2003, the micro line under the magnifying glass was composed of the four letters "GLTB", which is the abbreviation of "Gandhi Tax".

Anti-counterfeiting in this way can form micro-line ground pattern, micro-line lace, micro-clustered flower effect in shade design, and can also be arranged alternately in Chinese and English. The miniature design is convenient and fast, and the expression is exquisite and unique, full of change, which plays the dual role of anti-counterfeiting and creativity.

4. Unlock

Unlocking is a relief effect formed by the interference phenomenon of light. Unlike ordinary reliefs, its bump effect cannot be seen directly, but only through a special "diaphragm" to see the true face of the relief image. The material of this diaphragm is similar to that of film, and its interference intensity with light should be matched with the design program, that is, the diaphragm and the hidden design content are in one-to-one correspondence. The diaphragm is an essential tool for observing patterns, it is like a key to unlock the mysterious lock. Therefore, the anti-counterfeiting effect of this super line is called "unlocking". The content of the unlocking effect cannot be recognized by the naked eye. Even if the shading is reproduced by copying methods such as photography and scanning, it is impossible to copy the unlocking effect together, which is extremely anti-counterfeiting. In addition, unlocking also has the characteristics of wide application range, flexible form, low production cost, and easy identification. It is a potential anti-counterfeiting method.

5. Splitting

In super line design, splitting a line is the effect of dividing a line into two or more thin lines to form a pattern. Its main feature is that the thickness of continuous lines can be changed. For example, after splitting a 1.2mm line, two 0.6mm thin lines can be formed, and three 0.4mm thinner lines can also be generated. The line can be divided into multiple from one, and can also be composed of multiple, and it is continuous. This type of line is impossible to achieve by general graphics processing software, and the thickness of this line frequently changes in the splitting effect, which makes it difficult to recognize the image input device, so that it cannot be recognized at all, and has a very strong Anti-copy function, so its anti-counterfeiting function is obvious.

Understand the various anti-counterfeiting functions of shading. When applying shading anti-counterfeiting technology, you should also pay attention to the following two points:

1) If the bill with anti-counterfeiting shading may be reprinted multiple times, the design draft and related data must be left. Such as the thickness of the line, the angle of inclination, the cycle of the cycle, the ratio of the spot color, etc., for the next use. Otherwise, you may no longer be able to design the same anti-counterfeiting shading as the previous one, and make a joke that you have "prevented" yourself outside;

2) In the use of shading, it is not advisable to use colors that are too pure and too bright. This is because the bright colors with high purity are easily separated by color filters through photography, etc., which is convenient for counterfeiters to copy. Therefore, the use of mixed colors with low saturation as much as possible is conducive to anti-counterfeiting. In the process, a small amount of black or brown ink is generally added to the color ink to reduce the purity of the color ink and improve the anti-copy performance of the shading.

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