The artistic effect of spot color printing on stamps
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The stamps are small prints, but the print volume is very large. Not only do a plate have dozens or even hundreds of patterns, but the color and level of each pattern are exactly the same; and the stamps of the same pattern are printed repeatedly. Tens of millions of pieces, the printing cycle sometimes lasts for several months. Such long-term, high-volume printing of the same product, but also to meet the high quality needs of philatelists and consumers, not only in the entire version of the stamp must be accurate, but also to ensure the color of the front and back printing The level is consistent. This requires the design of the pre-press process to take into account its characteristics, to ensure the repeatability of printing. For this reason, in addition to the use of conventional yellow, magenta, cyan, and black inks in stamp printing, the application of spot color inks is also essential. According to the characteristics of the original, different spot colors are used for printing, and the printed stamps can achieve satisfactory artistic effects and high qualification rates. Therefore, spot colors are often used in stamp printing, and they are mainly used in the following aspects.
(1) background color
In the printing of stamps, there are two different manifestations of the background color. One is the background color that often appears in the stamp picture as the background of the theme pattern. Although it is not the theme of the picture, it plays a very important role in the whole picture. The important setting effect directly affects the artistic effect of the stamp picture. In order to make the color of the finished stamps after printing in large quantities basically the same, there is no obvious color shift phenomenon, which can perfectly reproduce the artistic concept of the designer. This background color is generally printed by color. When the background color of the original background is relatively dark or the area of the stamp is relatively large (such as a sheetfed sheet), it is also designed to print two deep and light spot colors of similar hue, so that the printed stamp has the bottom of the picture. The color matches the original, and the ink layer is thick, flat, not flowered, and does not leak white spots, which can truly reproduce the artistic effect of the original.
There is also a background color that is used in the prepress process design. In order to facilitate the printing control of the hue and to compensate for the color difference between the printed matter and the draft, the background color of the stamp pattern is artificially added, and it is also printed by spot color. This is because the manuscripts of stamp patterns often use some Chinese paintings, gouache paintings, and oil paintings. Some of the art works are very beautifully designed, the colors are very rich, and the layers change vividly. If you use this kind of manuscript to copy the stamp, if you simply use the three primary colors and the black superimposition to reproduce the picture, the pattern color of the stamp picture will be monotonous and thinner than the original, which often gives people the feeling of lack of color, which is not as good as the original color. Rich and thick, the changes between colors are also blunt and uncoordinated. The scenes of the picture are also dull and rough, and the artistic effect of reproduction is not ideal.
On the other hand, from the printing point of view, if the stamp image completely relies on the superposition of the three primary colors to produce a color change, it is more difficult to make the ticket face color consistent in high-volume printing. In this case, in order to perfectly reproduce the artistic charm of the original and obtain a high-quality stamp product, the process design is based on the main color of the original image, and one or two spot colors are set as the background color of the pattern portion. Paving, which is the complement of color, such as: deep, light gray, deep, light yellow, purple, etc., plus three primary colors. In this large-volume printing, the main color of the ticket surface is fixed, and the ink color can be easily aligned to ensure the printing quality. At the same time, the artistic effect of the stamp picture is greatly improved, and the color tone is basically the same as the original. Moreover, the smudge effect of the original color is better reproduced, the color is rich and soft, the color changes naturally and harmoniously, and the whole picture is flat and delicate.
(2) the skin color of the character
The skin color of the character, especially the skin color of the face, is an important part of the character pattern and the main rendering part of the art design. This is also crucial in the printing of other books and advertisements. It is even more prominent in the stamp of the stamp. Due to the small size of the stamp, the skin color of the face is smaller. If the three primary colors are used for overlay printing, it will bring some difficulty to the overprint and ink color control. For example, after mass printing, the facial skin color of the finished stamp often shows color cast, some are reddish, some are yellowish, and the overprint is inaccurate, and the contour of the face will be deformed. In particular, the stamps of the character theme, if the subject's facial color is inconsistent, or the outline is unclear, will affect the character's image, directly affecting 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 color hue of the original, a spot color is generally used as the main color of the skin color, and then the three primary colors are added to the level, so that the printed color of the stamp has little change in color, the overprint is accurate, and the contour of the face is clear. The level transition is natural and soft.
(3) Neutral gray
Neutral gray is a sign to check the balance of the three primary colors in printing. Therefore, the reproduction of neutral gray in printing has certain technical difficulty, especially the neutral gray of light color, its color change is more visually sensitive, and the ratio of three primary colors With a slight deviation, the hue will be far apart. In the high-speed operation of large-volume stamp printing, if the neutral color is reproduced by the three primary colors, the technical difficulty and labor intensity will be high, and the final product yield is very low; the neutral gray color on the ticket surface will be Color cast. If the standards for quality inspection of finished products are not properly mastered, it will bring confusion to the philatelic market. In order to avoid the above phenomenon, in the process design, the neutral gray part of the ticket surface is generally printed with a spot color gray. Such pre- and post-printed stamp products will not have any discrepancies in the hue, which can greatly improve the yield of finished products, shorten the production cycle and save raw materials.