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What is the tone standard of color in book printing?

Time: 2021-07-19 Hits: 178


The general business to do publicity is to be able to show their products to customers in a real way, so at this time the color of color in book printing design is very important, because now is not the sixties and seventies, only black and white, now the society is very wonderful, people also pursue wonderful life, so the color matching standard is particularly important. The following are some brief descriptions from book printers in china about the hue standards of color printing design



Tone standard of color printing design


In china book printing design, the ink three primary colors are mixed in different proportions to obtain the desired color spectrum hue value. Whether the density of the three primary colors ink on the substrate is correct and balanced or not is directly related to the printing designers. Although the printing design operator can only measure and set the ink density in a limited range, these density ranges can help the printing designer to obtain a larger range of overprint ink colors, whether the ink is transparent or not, or whether the substrate is pure white or not. In printing design, we can easily find these density ranges in various related publications: for example, they are described in first and swop standards.


In printing design, according to the ink density range on the instruction, it can be used for any ink overprint sequence, namely YMC, YCM, CMY, CYM, mcy or myc. But in the printing design, does each order produce the same color? Not really.


Even if the field density is controlled at the absolute value, each overprint sequence in the printing design will produce different overprint colors of red, green and blue, because each book printing ink formula has its own properties, such as the ink opacity that affects the coverage. Therefore, the surface energy of the dry film of the first printing (printing design) ink will affect the adhesion characteristics of the wet ink of the second printing (printing design).


The covering rate of yellow pigment is poor, and that of magenta and cyan pigment is good. But the surface energy of yellow pigment ink is high.


The first step of color management in book printing design is to determine the best ink overprint sequence and density balance which can provide high color rendering range.


Many years ago, GATF developed a simple hexagonal color map to visualize the ratio of different colors. The densitometer can be used to measure the hue deviation


Gray and overlay color to show the pros and cons of color, and compared with the three primary colors.


For example, in the hexagonal color map, the three corners that are not adjacent to each other are the ideal ink primary color (YMC), the other three corners are the overprint composite color (RGB), and the center of the hexagon is the neutral color (white to gray to black). The greater the ink color, the closer to each corner, the farther away from the neutral color.


When the printing color and composite color of the actual printing design are distributed in the hexagon color map, the density, color difference and gray value of the three primary color ink (CMY) and composite color (RGB) are presented.


Because the ink is not ideal, the distributed hexagon (irregular) will not be the same size as the whole ideal hexagon color map, but it can be used for optimal printing. Therefore,


The best density and overprint sequence can be obtained by using Gaft method to display the information of primary colors and composite colors in irregular hexagon distribution.


By measuring the coverage area size of the color, the color rendering performance of the whole ink and the contrast intensity of the book printing design color are determined. Of course, the larger the area, the better.


Other density values can also be distributed as part of the measurement sequence of printing design, such as 25% dot, 505 dot and 755 dot density values of color.


If the distribution of these other hue values is concentrated, it means that the printing design is under control. On the contrary, if the distribution is not concentrated, it means that the printing design is out of control and necessary adjustments should be made.


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