Color printing is a way of copying images or text in color. (correspondingly, it is only black and white printing, or monochrome printing). It involves many steps, or transformation processes, to produce high-quality color reproductions.
The color separation process is used for digital scanning of the manuscript, and the manuscript is divided into red, green and blue components. Before the development of digital imaging, the traditional method of color color separation was to take 3 images of the image, and each time a different color filter was used to filter different light. But after the color separation, the result is 3 gray images, which represent the red, green, and blue components of the manuscript, and the next step is to convert each color. When generating the red component of the negative image, the generated image represents the green component of the image. In the same way, the green components and blue components of the negative images are also generated, so as to produce the finished red and yellow dichroic films accordingly.
Green, magenta and yellow are subtractive primary colors, because each color represents the two primary additive colors from a white light. Cyan, magenta and yellow are the three main pigments in color reproduction. When these three colors are combined in printing, they can reproduce the original manuscript reasonably, but in fact, this is not the case. Because of the limitation of ink pigment, the darker colors are dirty and dirty. In order to solve this problem, we need to create a black plate to improve the color of the dark part and enhance the contrast of the image. There are many technologies that can produce this black plate from the original image. These technologies include gray composition replacement, background removal and background color increase.
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