In the process of album printing, the most important link is the color matching of album printing. The accuracy of a printer's grasp of the color of a product is related to the quality of the product printed.
In the previous production, because RGB gamut space is larger than CMYK, it is processed in RGB mode before it is formally transferred to print. Of course, it can also be processed in Lab mode, which is only the default RGB mode. Why do we make such a transition? It is because RGB three colors belong to the three primary colors of light, which accords with color addition; while CMYK is the four primary colors of ink, which accords with color subtraction. In fact, black ink can not be considered as the primary color, but it is generally used to replace the mixing of other three colors. The most intuitive performance is the same image, CMYK mode is darker.
Ink blending is an important work in color printing process. How this work works is directly related to the quality of picture album printing. Because bright color, good brightness and accurate hue are the basic requirements of color printing products, in order to achieve this requirement, we must first accurately mix printing ink. Therefore, operators should master color knowledge and ink mixing technology.
Grasp the changing law of the three primary colors in order to achieve accurate ink blending: any color can be mixed with different proportions of the three primary colors, and the change of the color phase of the ink is precisely using this law. If the tri-primary ink is mixed and blended equally, it can become black (approximate). Equivalent mixing of three primary colour inks and adding no
With the same proportion of white ink, it can be blended with various tones of light gray ink.
If the three primary colour inks are mixed in various proportions, they can be blended into a variety of different colour phases, but the colour phase is biased to the larger proportion of the primary colour. If the two primary inks are blended equally, they can become standard inter-color. When the two primary inks are blended in different proportions, they can be blended into various inter-color phases, but their color phases tend to be larger in proportion. In addition, the color of any color ink becomes brighter when white ink is added. Conversely, when black ink is added, the color becomes darker.
Analysis of the original color phase: Use complementary color theory to correct bias and improve toner effect. After receiving the printed color manuscript in the picture album, first of all, we should carefully appreciate and analyze the various colors in the original, and grasp a basic principle, that is, three primary colors are the basic color of any ink. Generally speaking, any complex color can be blended except gold and silver color by applying the changing rule of the three primary colors. However, in the process of technological practice, it is not enough that only three primary colors of ink should be used to mix out innumerable kinds of ink colors. Because, in fact, the pigments used to make inks are not very standard, and even the color of each batch of inks is inevitably different to some extent. Therefore, in practical work, we should also use such inks as medium blue, dark blue, light blue, light blue, medium yellow, deep yellow, light yellow, golden, orange, deep red, light red, black, green and so on to achieve the required ink color. There are many kinds of inks, but in any case, except the three primary colors, other colors are used to supplement the shortcomings of the three primary colors. Any complex color always varies in the range of three primary colors. As long as we master this principle well, it will not be a problem to adjust ink. When the color analysis determines the principal color and auxiliary color ink and proportion, it can be adjusted. However, if the color is mismatched, the complementary theory can be used to correct the color.
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