In the colored light addition method, the three colored lights are added in equal proportions and mixed to form white light. Blue and green light are mixed into blue light, blue and red light are mixed into red light, green and red light are mixed into yellow light and so on. These phenomena are unacceptable to most people, because people's extensive practice is subtractive color method-the addition of colored bodies, such as drawing color pictures, paint color matching, etc., are the principles of subtractive color method, and for a For a famous offset printing operator, not only should he understand the principle of color light addition, but more importantly, how to use the principle of subtractive color to guide the actual operation. In the actual printing, spot colors are sometimes used as a setting according to the original design needs. In addition, some products printed with four-color primary inks are not easy to control due to overprinting problems and water-ink balance, and it is not easy to achieve the ideal copy effect. Sometimes, spot color printing is also required, especially in packaging and decoration printing. , More choice of spot color printing.
One should carefully analyze the color draft or sample draft before mixing the ink.
When analyzing color drafts, it is mainly to analyze the colors on the color drafts and the inks used. The basic principle is that the three primary colors of the colorant are the basic colors of all the ink colors, and they never change. At the same time, it is necessary to understand as much as possible whether the color draft is based on screen printing or on-site printing. If screen printing is the main method, the ink should be focused on the consistency of the background color. If printing on the ground, the ink can be focused on the face color. If both are used, the background color of the ink should be adjusted. Both look and look.
When the color draft is analyzed, the color of the ink used should be analyzed. Generally speaking, the operator or captain of the ink preparation is particularly sensitive to the observation of the color of the ink. It can be seen that the components, such as yellow ink, must be good at identifying it Whether it is yellowish or blueish (or greenish), for magenta ink, it is good to identify whether it is reddish or blueish (or purple), and for cyan ink, it is good to identify it is reddish The phase is still green (or yellow). If green ink is mixed with cyan ink with red phase and yellow ink with red phase, the green color obtained by mixing will become dark, because this is actually equivalent to adding magenta ink (yellow + cyan + magenta) to cyan ink and yellow ink Red = black), therefore, the observation of the ink color is an essential basic skill for offset operators.
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