Ink color tone before the considerations

In the color light addition method, equal proportions of the three color lights are added and mixed to form white light. Blue and green light are mixed into blue light, blue light and red light are mixed red light, green light and red light are mixed into yellow light and so on. These phenomena are unacceptable to most people, because people's broad practice is the subtractive method - the addition of color bodies, such as drawing color pictures, paint color matching, etc., are all subtractive principles, and for a For an offset printer operator, it is not only necessary to understand the principle of color light addition, but more importantly, how to use the principle of subtractive color to guide actual operations. In the actual printing, according to the original design needs, sometimes need a special color as a foil. In addition, some products printed with four-color original ink are not easy to control because of overprinting problems and ink-water balance. It is not easy to achieve the desired reproduction effect. Sometimes, spot color printing is also required. Especially in packaging and decoration printing, some products pursue individuality. More choices for spot color printing.

Carefully analyze the manuscript or sample draft before deploying ink.

When analyzing a color draft, the color of the color draft and the ink used are mainly analyzed. The basic principle is that the three primary colors of pigments are the basic colors of all inks, and they must remain the same. At the same time, it is necessary to make clear as far as possible whether the color draft is based on network printing or on-site printing. If the network printing is the main method, the ink color should be focused on the same color. If the printing is mainly based on the field, the ink can be mainly focused on the face color. If the two are combined, the background color when the ink is mixed. Both look and look.

When the color draft is analyzed, the color of the used ink should be analyzed. In general, the ink preparation operator or the captain is particularly sensitive to the observation of the color of the ink, and the components thereof can be seen, for example, the yellow ink, to be good at identifying it. Is it with a yellow phase or with a blue phase (or with a green phase), for magenta ink, it is good at identifying whether it has a red phase or a blue phase (or purple phase). For blue ink, it is better to identify it with red The phase is still green (or yellowish). If green ink with a red ink with a red phase and yellow ink with a red phase are used, the resulting green color will be dark because it is actually equivalent to adding a magenta ink to the yellow ink and yellow ink (yellow + blue + product). Red = black), so observing the color of ink is an essential basic skill for offset printing operators.