What is the difference between spot color printing and four-color printing?
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What is spot color and spot color printing?
A: Spot color means that when printing, instead of printing C, M, Y, K four colors to synthesize this color, it is specifically used to print the color with a specific ink. Spot color inks are pre-mixed by the printing house or produced by the ink factory. For each spot color of a print, there is a special color version corresponding to the print. Use spot colors to make colors more accurate. Although the color cannot be accurately represented on the computer, the pre-printed color sample card of the standard color matching system can see the exact color of the color on the paper. For example, the Pantone color matching system creates a very detailed color sample card. . For the non-standard spot color set in the design, the printer does not necessarily accurately allocate it, and the exact color cannot be seen on the screen, so don't use your own defined spot color if it is not a special requirement.
The inks prepared by the spot color printing are obtained according to the mixing principle of the color reduction method, and the color brightness is low and the saturation is high: the spot color of the ink color is usually printed in the field, and the amount of ink is appropriately increased. When the thickness of the ink layer of the printing plate is large, the sensitivity of the change of the thickness of the ink layer to the color change is lowered, so that it is easier to obtain a uniform and thick printing effect.
The color blocks printed by the four-color printing process are composed of a certain proportion of dots, and 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. A change in process conditions causes a change in color intensity. Changes in the degree of expansion of outlets. This causes a color change. Moreover, since the change of any color constituting the color block causes the color of the color block to change, the chance of unevenness of the ink color will be multiplied, 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 multicolor machine to overprint the color of the color block at a time. It is also easy to cause color shift due to the difficulty in controlling the color of the semi-finished product. In addition, the four-color printing is a combination of the subtractive color absorption and the additive color mixing of the dots, and the color block has a high brightness and a low saturation. For the light color block, the four-color printing process is adopted, and the ink has a low coverage, and the ink color is dull and lacks a thick feeling. Due to the angle of the dot, it is inevitable that people will feel the existence of the pattern.