The Use of Spot Color Art in Stamp Printing

At present, the carton industry is facing a situation where raw material prices are rising, carton prices are difficult to control, and profit margins are getting smaller and smaller. In order to reduce carton costs and occupy more market share, many carton companies have moved a lot on the selection of raw paper Brains-use low-gram weight and low-grade base paper for production. However, due to the limitations of the workers' technical qualities and the existing production equipment, it is difficult to produce satisfactory products. Poor adhesion, severe bending, and soft cardboard often occur. The carton factory is at a loss for this. So, is there a solution? This article will take the transformation of a carton enterprise as an example to explain how to carry out "small reforms" according to the paper consumption and equipment structure of the enterprise, so as to tap the potential of product quality improvement and make the enterprise burst into vitality.

Stamps are small-area prints, but the amount of printing is very large. Not only do dozens or even hundreds of patterns need to be arranged on a quick printing plate, but the color level of each pattern is completely the same; and the same pattern of stamps must be printed repeatedly Thousands of thousands, and the printing cycle sometimes takes months. For such a long period of time, printing the same product in large quantities must also meet the high quality requirements of stamp collectors and consumers. Not only must each overprint in the full-page stamp be accurate, but also to ensure the color of the front and back printing. Reach agreement. This requires consideration of its characteristics in the process design before printing to ensure the repeatability of printing. For this reason, in addition to the conventional yellow, magenta, cyan, and black four-color inks used in stamp printing, the application of spot color inks is also essential. According to the characteristics of the manuscript, different spot color inks are used for printing, and the printed stamps can achieve an impressive artistic effect and a high pass rate. Therefore, spot colors are often used in the printing of postage stamps. It is mainly used in the following aspects.

1. Background

In stamp printing, the background color has two different manifestations. One is the background color that often appears on the stamp screen as the background of the theme pattern. Although it is not the theme of the picture, it is very important for the theme in the entire picture. The effect of the direct influence directly affects the artistic effect of the stamp screen. In order to make the background color of the finished stamps after mass printing basically the same, there is no obvious color shift phenomenon, and it can perfectly reproduce the artistic conception of the designer. This background color is generally printed by color. When the background color of some manuscripts is darker or the area of ​​the stamp is larger (such as a small sheet), it must be designed to print in two dark and light spot colors with similar colors. The color is consistent with the original, the ink layer is thick. Plain clothes. No flowers. No white spots. It can truly reproduce the artistic effect of the original.

There is also a background color in the process design before printing. In order to use printing to control the hue and make up for the color difference between the printed matter and the artwork, the background color artificially added to the stamp design part is also printed in spot color. This is because the original manuscripts of stamp designs often use some Chinese paintings and gouache paintings. The paintings of these paintings are very exquisitely designed, with very rich colors, and the layers are very colorful. The use of such paintings to reproduce the stamps, if you simply use three primary colors and black overlay to reproduce the picture Compared with the original, the color of the stamp screen will be more monotonous and thinner, often giving people the feeling of lack of color, not as rich as the original color. Thick, the changes between colors are also more rigid and uncoordinated, the scene of the picture It also appears that the artistic effect of dull and rough reproduction is not ideal.

On the other hand, from the printing point of view, if the stamp screen completely relies on the superposition of the three primary colors to produce color changes, it is more difficult to make the color of the ticket face consistent in mass printing. In this case, in order to perfectly reproduce the artistic charm of the original and lose the high-quality stamp product, one or two spot colors should be set as the background color of the pattern part according to the main color of the original screen during the process design. , That is, the supplement of colors, such as: dark, light gray, dark, light yellow, purple, etc., plus three primary colors. In this way, when printing in large quantities, the main color of the ticket surface is fixed, so it is easier to make the ink color consistent and ensure the printing quality. At the same time, it also greatly improves the artistic effect of the stamp screen. Make the color tone consistent with the original. And it also reproduces the rendering effect of the original color better. The colors are rich and soft, the colors change naturally and harmoniously, and the whole picture is plain and delicate. [next]

Second, the character's skin color

The skin color of the character, especially the skin color of the face, is an important part of the character's drawing, and it is also the main rendering part of art design. This is also crucial in the printing of other books and periodicals. It is more prominent in the printing of stamps. Due to the small area of ​​stamps, the area occupied by facial skin color is even smaller. If three primary colors are used for superimposed printing, it will bring certain difficulties to overprinting and ink color control. For example, after mass printing, the face color of the finished stamps often has a color cast, some are reddish, and some are yellowed. In addition, the overprint is not accurate, and the contour of the face will also be deformed. Especially for character-based stamps, if the subject ’s facial skin color is inconsistent, or the outline is not clear, it will affect the image of the character, directly affect the artistic effect of the stamp, and of course, greatly affect the quality of the stamp. Therefore, in the process design, according to the skin tone of the original, a special color is generally used as the main color of the skin, and the three primary colors are added to the gradation. In this way, the color of the skin part of the stamp is not changed, the overprint is also accurate, and the facial contour is clear Natural transition. Soft.

Three, neutral gray

Neutral gray is a sign to check the color balance of the three primary colors in printing. Therefore, there are certain technical difficulties in the reproduction of neutral gray in printing, especially the light gray neutral gray, its color changes are more visually sensitive, the ratio of the three primary colors is slightly deviated, and the hue is very different. In high-speed mass printing of stamps, if three primary colors are used to reproduce neutral gray, the technical difficulty and labor intensity will be very high, and the final product pass rate is very low, the color of neutral gray on the ticket surface will be discolored. Improper mastery of quality inspection standards for finished products will cause confusion to the philatelic market. In order to avoid the above phenomenon, in the process design, the neutral gray part on the ticket surface is generally printed with a spot color gray. In this way, the finished stamps printed in batches before and after will not have any difference in hue, which can greatly improve the qualified rate of finished products, and also shorten the production cycle and save raw materials.

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