Color correction color document printing color copying process is decomposition of the image information and color reduction combination of both processes. In the actual copying process, because the conditions are not ideal, there is a color difference is inevitable. Its color comes from three aspects: 1, the original color shift due to the photographic process itself and caused material and coloring medium color (color decay) color shift caused. 2, the color separation process light, lenses, filters and photomultiplier tubes error caused by the cast. 3, color reduction process error caused by paper and ink color cast. Must be color corrected. Color correction is necessary to eliminate the chromatic aberration during color copying an objective reality, but also to meet the special requirements when the original color reproduction of color correction. Color correction is usually cyan (Cyan), magenta (Magenta), yellow (Yellow), red (Red), green (Green) and blue (Violet), six colors as a reference. For a certain tone as the basic color of the image can be exaggerated to make the appropriate basic colors and shades to make it to the foot of the printing effect is more prominent, may be appropriate to reduce the amount of the opposite color, to enhance the basic color of purity. Without affecting the overall picture gray balance basis, regional processing methods can be used on the local body color correction. For some gray as the main picture, an appropriate increase in color purity of color enhances the overall visual effect of the image. In short, the color correction is equipment, manuscripts, technology and operations personnel a comprehensive reflection of the quality of color reproduction in the only master them, to be able to the actual needs of users to be original and best performance. Proofer and the press is very different. Press used the "Rotary" printing methods, and proofer is a "flattened circles" of printing. In addition, the printer ink, the degree of automation is very high register. Proofer is mostly adjusted by the operator based on personal experience to the amount of ink, and colored version of the registration is carried out by hand. While the proofing process, the operator must rely densitometer constantly measuring field density and 80% at the dot density and dot gain to adjust to the size and the amount of ink ink-water balance, but the process still must shovel ink ink shovel to put ink proofer roll. Therefore printing, proofing level of quality and operational personnel color cards are closely related. Field density control dot reproduction and restore the most important technical parameters. Different companies have their own different technical indicators and error range. This technical indicator is the companies according to their specific circumstances and given. General colored version of the field density Y: 1.30, M: 1.45, C: 1.50, K: 1.80. As the error range, the European standard ± 0.07. It is said that a domestic company controlled within the range of error ± 0.05 range. Like with the printing, proofing control of water balance is very important. The principle of printing is essentially incompatible with the principle of water: the network part of the lipophilic exposure to form an image on the PS version is hydrophobic, partially hydrophilic blank unexposed not lipophilic. Therefore, to maintain a good ink-water balance is essential. Too little water polished PVC color card printing, it will lead to dry version, reflected in the proof is the emergence of dark tone and grade level; polished too much water will cause network deformation color card printing, dot will appear on the sheet "Hollow Point." So packaging color card printing, wiping how much water should control it? In general, water polished as possible. Grasp the scale is when the stage after the water roll version can not see the presence of water. Technical parameters dampening solution quality control among proofing often overlooked factor. Technical parameters fountain solution conductivity and pH value mainly. Their criteria are: electrical conductivity of 800 ~ 1 200, pH value of 4.8 to 5.2. Packaging color card printing | beyond printing (certified) | Hengli color cards printed by the Dongguan City, often beyond packaging products factory provided. Dongguan Chang-ping beyond packaging products plant (www.dgcyp.com) Dongguan, Guangdong, printing paper leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In all walks of life beyond the printing leadership with the staff warmly welcomed the inquiry negotiations to create a better future beyond printing.