Why is chromatography indispensable for color reproduction?

Chromatography spot color chromatography and primary color chromatography. The platemaking process uses primary color chromatography. In the early photoengraving and electroplate making methods, since the reproduction effect of the speech color to the color separation could not be directly observed, it was necessary to visualize the color effect of the final reproduction based on the ratio of the dot percentage of the primary color plate. At this time, it was very useful to use the primary color chromatography. . Primary color chromatography is a color map with various colors, consisting of three primary colors Y, M, C and black ink, arranged in a certain proportion and manner. Each color cell is equal in size, arranged in order, and marked with the dot percentage of each color version. In the process of color reproduction, the corresponding dot combination can be found on the chromatogram against the darkest, lightest, and midtone levels of the monochromatic, inter-color, or polychromatic colors on the original. Therefore, chromatography can help lithographic color platesetters and printers to grasp the basic proportions of dot-tone reproduction colors and measure the accuracy of color reproduction of plate-making printing. Chromatography is also the basis for color determination by the plate-making staff and the publishing house. In the current desktop publishing process, people often do not use chromatograms due to the visual effects of screen or proofing. However, it is better to distinguish the color effect by chromatogram when copying the key color. It is also possible to use no chromatography if the color management technology is used very well. Spot color chromatography is a reference system for printers and publishers to select spot color inks for ink companies based on their spot color needs.