Four-color printing and spot color printing Help!
 2010/10/18 9:26:24  Dongguan Yinhai Printing Factory  Click:5054

Four-color printing and spot color printing Help!
1. What is the four-color printing?

    Four-color printing process generally refers to the use of yellow, magenta, blue RGB color ink and black ink to copy all the original color of the printing process.

    2. What is a spot-color printing?

    Spot color printing is the use of yellow, magenta, green. Four-color ink black ink color other than the color of ink to copy the original printing process. Often used in packaging and printing spot-color printing process printing color in large area.

    3. What products must be four-color printing process?

    Way with the color photography taken a variety of color changes reflect the nature of the photographs, the artist's works of art or other color contain many different colors of the screen, out of process on the request or because of economic considerations that must go through electronic color scanner scans color or color desktop, and then four-color printing process used to copy complete.

    4. What kind of product will use spot color printing?

    Packaging or the cover of books and often by a different color or colors of the uniform law of gradient color and text to form, the color and text can be used after separation from four-color ink overprint, spot-color ink can also be deployed , and then only printed in the same color at a particular spot color ink. After considering overprint improve print quality and save the number of cases, sometimes to use spot color printing.

    5. Color and spot color printing four-color overprint color out of the visual effect of its color different?

    Deployment of spot-color printing is based pigment ink out of subtractive color mixing principle to obtain, the lower the color brightness, saturation was high: the special color ink even printed usually on the ground, and to appropriately increase the amount of ink When the layout of ink film thickness is large, the ink film thickness changes the degree of color change will reduce the sensitivity, so more likely to get ink evenly, solid print results.

    Four-color printing process using a color overlay that, due to a variety of colors constituting the color most by a certain percentage of network composition, network printing, the ink thickness must be strictly controlled, vulnerable to changes in the thickness and printing ink changes in process conditions caused changes in color intensity. Degree of change in dot gain. Resulting in color changes. And because the composition of the color of any color will cause the color change color change, resulting in uneven ink opportunity to multiply, so the use of four-color printing process out of the color overlay is not easy to obtain uniform ink effect. If you can not multi-color machine with a trapping out the color of the color. Semi-finished products also vulnerable to the emergence of difficult to control the color hue. In addition, the four-color printing by the absorption and processing network of the subtractive color mixing method combined effect of high color brightness, saturation is low. For light color, using four-color printing process, ink on paper as low coverage, lack of solid ink dull feeling. The relationship between the network point of view, will inevitably make people feel that the existence of patterns.

    6. From the perspective of improving product quality, what kind of products suitable for use spot color printing?

    Large light-colored uniform in color printing, usually used in the original ink to add: to deploy special agents in light colored ink, then printed on-site, so that thicker layers of ink is easier to get the color uniform, solid results. If using four-color printing process, you must use the number of low cost flat screen network. However, the number of flat-screen low-cost network printing down easily when in the sand or by the small individual parts caused by poor ventilation outlets slightly smaller, resulting in uneven ink: print layout Shiyou vulnerable to water too much. Paper powder accumulated on plate and blanket, paper smoothness and low causes poor ink transfer of small outlets. Lighter ink and ink to appear uneven.

    For large areas of dark color, four-color printing process, colors may be required by several high-salt superposition of the number of outlets, thick layers of ink on the back rub prone to dirty; the use of spot color printing process, simply print a color, easy to rub the dirty back there. Using four-color printing process, some parts may be graphic color from several synthesis; the use of spot color printing process, the corresponding parts of India and only one color, to avoid the overlay error may occur.

    7. From the economic point of view, what kind of products suitable to use spot color printing?

    From the economic point of view, mainly to see the use of spot color printing technology can save the overlay times. Overlay can save by reducing the number of printing costs, but also save the cost of pre-press.

    8. A product can be used four-color printing and spot color printing?

    If both a product of the screen picture color level, there are large areas of background color, the color level can be used to screen part of the four-color printing, and color in large area can be spot-color printing. The benefit is: four-color printing part of the screen by controlling the site density can be restored correctly, some background color to increase the amount of ink through the proper uniform can be obtained solid ink visual effects. This method is high-end packaging products and printing stamps is frequently used in production, but due to increase in the number and color, but also increase the cost of making the printing plate.

    9. Using four-color printing process, if there is a large area of black spot, black spot more conducive to how the plate thick ink?

    Using four-color printing process, in order to ensure that the correct restore order harmonic colors, each color of ink thickness should be strictly controlled. Usually in four-color printing, black-site density of less than 1.8, the density of printing in such a large area of black on the ground, will the lack of solid visual effects. Force method is commonly used in large parts of the black spot about 40% of the green overprint. Field trapping a small amount of black, blue, or black from the hue point of view, it will be more solid visual effects. Originally printed in only one color black on white paper, due to the printing process paper hair. Paper powder accumulated on the blanket, or for other reasons affecting the transfer of ink, the black spot will appear on the white sand holes, black and white contrast is very conspicuous. If you overlay the blue flat screen, even if there is a black spot on the meager trachoma, the exposed paper is no longer a white base, but the blue dot, as opposed to black and white contrast, the black-blue contrast is not so clear, you can the black background looks more uniform appearance.

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