In color printing, the color should meet the basic requirements of the original. In addition to the reproduction of ancient paintings or other picture arts and crafts with special requirements, securities, etc., generally speaking, color printed materials also have bright color quality requirements. How to achieve this quality requirement from the color printing process and the selection of raw materials? The author thinks that we must grasp the following conditions in order to achieve the effect of bright color printing. 1、 The whiteness of paper and the whiteness of absorbent paper are the basis of bright printing color. Completely white paper, can reflect nearly all the color light. On the contrary, gray, black paper will absorb part of the color, so that the color of the imprint, brightness and purity are lost. If we analyze from the color degree, on the paper with pictures, the color of the surface of the paper with no dot (or pattern) actually participates in this kind of spatial mixing, except for the visual color formed by the spatial mixing of various color dots through the color adding method. Gray paper is like a small amount of ink added to the various colors of ink, so you can't see high purity color ink visually, showing the dark color. Practice has proved that if other conditions are exactly the same, the brightness of the pictures printed on the paper with different whiteness is completely different. Only from the contrast of color brightness to analyze. If you only print black text and pure white paper, because of the contrast between black and white, the black characters are more black and the white paper is whiter, forming a sharp contrast. It can be inferred that as the basis of printing, the whiteness of paper is directly related to the bright degree of imprinting color. In the same way, the red color paper makes the imprint tend to be red, and the green paper makes the imprint tend to green, which should be considered when using color. In addition, the paper's absorption also has a great impact on color. The paper with strong absorption will make the pigment and binder infiltrate into the paper together, and the imprint can not form a sufficient ink layer on the paper surface, which will cause the loss of color saturation and make the color difficult to be bright. 2、 The blending of color ink and how to ensure the bright color in rolling and coating can be seen from the purity of the three elements of color. The saturation of color refers to the purity of color. In order to make the color bright, we should pay attention to the selection of color ink. In addition to the pure color of the standard three primary inks, there are many primary inks that are interchromatic of the three primary colors. Their hues are in line with the original, so as to increase the brightness of the imprint. To make the ink color bright, special attention should be paid to avoid complementary color. For example, in the lush forest in early spring, using light yellow can make the printed leaves green and lovely; if dark yellow ink is used, the yellow ink contains the red flavor, and red is the complementary color of green, and the printed leaves are dark and turbid, which can not reflect the flavor of early spring, let alone bright. Pay attention to the cleaning of ink groove and ink roller when printing. That is to say, when changing ink, it is necessary to prevent color deviation caused by ink groove, ink roller and water adhering to the ink of previous printing color, especially when changing from dark color to light color and from black and blue to printing yellow, if you don't pay attention to cleaning work, it will cause color deviation, which will also affect the brightness of printed matter.3、 When the dot is fully copied, the enlarged one color has to reduce the thickness of the ink layer, which makes the low tone and the field part not thick, and the color saturation is weakened, which can not give play to the inherent hue characteristics of this color. Printing clothes makes clothes look old, while printing scenery looks like rainy days. 4、 The coloring power and emulsification of ink, the influence of dilution, in addition to the special circumstances of color need to be diluted, the coloring power of color ink is low, and the ink color is diluted by adding auxiliary materials improperly in the printing process, or the auxiliary materials inhibiting drying are added, so the ink emulsifying capacity is large. These factors may reduce the printing ink and saturation. After printing on the paper, the drying is slow, the permeability is strong, the penetration time is long, the imprint ink layer is not thick, resulting in the imprint color is not very bright. 5、 Imprint ink layer thickness imprint ink layer thickness is just full, which is the key factor for the color to conform to the original, whether it is bright, this is particularly important when issuing printing samples. If the thickness of the ink layer deviates from the original copy, the hue of the superimposed picture will be distorted. It is very important to control the amount of ink in the first color of the basic color. If the foundation is not good, it will be difficult to remedy the problems in the future. In order to make the color close to the original, the amount of ink in the basic color is less, and all colors must be reduced accordingly. In this way, the ink layers of each color in the picture are less, and the color is not bright at all. On the contrary, if the base color ink layer is too thick, then all colors have to follow the thick, if not, the hue will be out of balance. Although the printing color is close to the original, the ink layer of each color is thicker, the paste at the low tone and the high tone is flat, so the printed picture is dull and dense. The level is not clear, and there is no bright color effect. In general, in order to achieve the effect of bright colors of pictures, enough ink should be printed. Only in this way can the ink layer of other color plates be printed fully. Otherwise, the ink color too deep and too light can not be remedied, especially after deep printing, it is more difficult to remedy. For example, excessive yellow ink is bound to cause the picture color ratio to lose balance, so that magenta, cyan ink volume is also increased, although the hue is close, but the dot and paste, leading to the decline in print quality.
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