Print color matching conditions
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In order to achieve a vivid color reproduction, it is necessary to satisfy two conditions on the basis of accurate hue: first, the color has a higher saturation, that is, the purity is better. The second color has a higher brightness. In addition, on this basis, we must pay attention to the following issues:
1 substrate
The substrate is the basis for the bright color of the printed matter. According to the color principle of the printed matter, in addition to the spatial mixing of the colored dots through the additive color method to form the visual color of the people, there is no color of the surface of the substrate on which the dot is printed. In fact, it is also involved in this spatial mix. Therefore, if the whiteness of the substrate is high, the brightness of the color can be improved. Conversely, the gray substrate is like adding a small amount of black to each color of the ink, thus showing a dull color. In addition, the amount of substrate absorbency will affect the saturation of the color. For a substrate with a large absorption, the imprint cannot form a sufficiently full ink layer on the surface thereof, and the binder excessively penetrates into the substrate to dry the blot. Paper with large pores will allow some pigments to penetrate into the paper together with the binder, thus reducing the color saturation and affecting the vividness of the color.
2 ink
The color characteristics of the three primary color inks directly affect the degree of bright color of the printed matter. The color, gray scale and efficiency of the three primary color inks of different models are different, so the vividness of the ink color is also different. Therefore, when printing fine products, it should be Use the same type of colorful inks from the same manufacturer. In addition, during the printing process, try not to add too much auxiliary agent to the original ink to make the ink emulsification or saturation decrease. When changing colors, if the previous color ink is not washed, the color shift of the latter color will be increased, and the gray level will be increased, thereby affecting the color reproduction of the printed matter.
3 plates
Most of the plates used in water offset printing are PS plates. The PS version is based on the polymer photosensitive layer as the basis of the text, and the printed plate image is slightly higher than the blank portion. The hydrophilic portion is a film of aluminum oxide. Waterless offset printing uses a unique pre-coated photographic offset printing plate. The blank portion is a silica gel that repels ink. The image portion is a layer of slightly concave polymer, and the surface of the plate is resistant to oxidation. The quality of the PS version directly affects the quality of the print.
4 ink layer thickness
In the actual printing process, the thickness of the ink layer affects the color reproduction. The thickness of the ink layer is thin, and the picture is gray and dull; the thickness of the ink layer is thick, the expansion value of the dot is increased, and the dark tone is easy to paste, and the picture is dull and the level is unclear. Therefore, the thickness of the ink layer must be balanced with the tone reproduction. In general, the thickness of the ink layer should be adjusted according to the provided sample under the premise of the quality assurance of the printing plate. For monochrome machines, pay special attention to the signature of the first color. The thickness of the first color ink layer directly affects the color reproduction of the entire picture.
5 overprint rate
The overprint ratio indicates the ratio of the amount of ink printed in the previous color to the amount of ink printed directly on the paper. The ratio is always less than 100%, which means that the amount of ink printed in the previous color is definitely less than the amount of ink printed directly on the paper in the latter color.
The size of the overprint rate affects the color saturation of the secondary color. The overprinting rate is large, the saturation of the color is large, and the color is more vivid. For a monochrome machine, the overprinting rate is generally higher, and for a multicolor machine, not only the overprinting rate is low, but also the color mixing phenomenon of the front and rear colors is caused.
6 outlet expansion
In the offset printing process, dot enlargement is inevitable, but the size of the dot gain is controllable. If the dot is enlarged, the color is relatively bright. On the contrary, the dot is enlarged larger, and the larger color is enlarged to reduce the thickness of the ink layer to ensure the correctness of the hue. This makes the dark tone and the solid part less thick and the color saturation weakened. Thereby affecting the color of the entire picture.