1. What is four-color printing?
The four-color printing process generally refers to a printing process that uses yellow, magenta, and cyan inks and black inks to replicate the various colors of the color manuscript.
2. What is spot color printing?
Spot color printing refers to the use of yellow, magenta, and cyan. A printing process that reproduces the color of the original document with inks other than black ink and four-color inks. In packaging printing, spot color printing is often used to print large-area background colors.
3. What products must use four-color printing process?
Photographs taken in the form of color photography reflecting the colorful changes in nature, the painter ’s color artwork or other pictures containing many different colors, must be passed due to technical requirements or economic considerations The electronic color separation machine or color desktop system scans the color separation, and then uses the four-color printing process to copy it.
4. What kind of products will use spot color printing?
The cover of packaging products or books and periodicals is often composed of uniform color blocks of different colors or regular gradient color blocks and text. These color blocks and text can be separated and overprinted with four primary color inks, or spot color inks can be mixed. , And then only print one spot color ink in the same color block. In the case of comprehensive consideration to improve printing quality and save overprinting times, spot color printing is sometimes used.
5. What is the difference between the visual effect of the color printing of spot color printing and the color printing of four-color printing?
The ink prepared by spot color printing is obtained according to the mixing principle of pigment subtractive color method. The color brightness is low and the saturation is high: the spot color block with uniform ink color is usually printed on the spot, and the amount of ink should be increased appropriately. When the thickness of the ink layer on the layout is large, the sensitivity of the change of the thickness of the ink layer to the color change will be reduced, so it is easier to obtain a uniform ink color and a thick printing effect.
The color blocks printed by the four-color printing process are mostly composed of a certain proportion of dots. The thickness of the ink layer must be strictly controlled when printing the dots, which is easy to change due to the thickness of the ink layer and printing. Changes in process conditions cause changes in color intensity. Changes in the degree of network expansion. This causes the color to change. And because any color change that constitutes the color block will cause the color of the color block to change, the chance of uneven ink color will increase exponentially, so the color block printed by the four-color printing process is not easy to obtain the ink color Even effect. If you can't use the multi-color machine to overprint the color of the color block. It is also easy to appear color shift because the color of semi-finished products is not easy to control. In addition, the four-color printing is obtained by the combined effect of subtractive color absorption and additive color mixing of the dot, the color block has higher brightness and lower saturation. For light color blocks, the four-color printing process is used. Due to the low coverage of the ink on the paper, the ink color is flat and lacks a thick feeling. Due to the angle of the dots, it will inevitably make people feel the existence of patterns.
6. From the perspective of improving product quality, what kind of products are suitable for spot color printing?
When printing a large area of ​​light-colored uniform color patches, it is usually used to add spot light agent in the original ink to prepare spot color ink, and then perform solid printing, so that the ink layer is thicker, and it is easier to obtain a uniform and thick color effect. If a four-color printing process is used, a low percentage of flat screen dots must be used. However, the low percentage of flat mesh dots is easy to cause small dots in some parts due to tiny sand or poor suction during printing, resulting in uneven ink color: it is easy to cause too much water supply during printing. Paper dust accumulates on the printing plate and blanket, and the smoothness of the paper is low, which causes poor ink transfer of small dots. As a result, the ink color becomes lighter and the ink color is uneven.
For dark and large-area color blocks, the four-color printing process may be used to superimpose several high-salt number dots of several colors. The ink layer is too thick and the back side is smeared; while using the spot color printing process, only one Color, it is not easy to appear dirty on the back. With the four-color printing process, some parts of the picture and text may be composed of several colors; while with the spot color printing process, the corresponding parts are printed with only one color, which avoids the possibility of overprinting errors.
7. From the perspective of economic benefits, what kind of products are suitable for printing with spot colors?
From the perspective of economic benefits, it is mainly seen whether the use of spot color printing process can save the number of overprints. Because reducing the number of overprinting can not only save printing costs, but also save the cost of pre-press production.
8. Can a product use four-color printing and spot color printing at the same time?
If a product has both a color gradation screen and a large area background color, the color gradation screen part can be printed in four colors, and a large area background color can be printed in spot colors. The advantage of this is that the four-color printing part can correctly restore the picture by controlling the solid density, and the background color part can obtain a uniform and thick visual effect of the ink color by appropriately increasing the amount of ink. This method is often used in the production of high-end packaging products and stamps, but due to the increase in the number of colors, it also increases the cost of printing plate making.
9. When using the four-color printing process, if there is a large area of ​​black solid, how to make a plate is more conducive to thick black ink?
When using the four-color printing process, in order to ensure the correct reproduction of tone and color, the thickness of the ink layer of each color should be strictly controlled. Usually in four-color printing, the solid density of black does not exceed 1.8, and printing a large area of ​​black solids at such a density will lack a thick visual effect. The commonly used force method is to overprint about 40% of cyan on a large black area.
A small amount of cyan is overprinted on the solid black, and the color is still black, but the visual effect will be thicker. Originally, when printing only one color black on white paper, it was due to paper wool during the printing process. The accumulation of paper powder on the blanket, or the transfer of ink due to other reasons, will cause white trachoma on the black ground, and the contrast between black and white is very conspicuous. If the cyan flat screen is overprinted, even if there is a small amount of trachoma on the black ground, because the exposed is no longer the white paper base, but the cyan dots, compared with the black and white contrast, the black and green contrast is less conspicuous, you can Make the black background look more uniform and beautiful.
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