Clever color printing design method

In print design, we can easily find these density ranges in various related publications: such as the FIRST and SWOP standards. The three primary colors of ink are mixed in different proportions to obtain the desired color spectrum hue value. The correctness and balance of the three primary colors of ink printed on the substrate are directly related to the printing designer. Although the printing design operator can only measure and set the ink density within a limited range, these density ranges can help the printing designer obtain a larger range of overprinting ink colors, regardless of whether the ink is transparent or the substrate is pure white.

The ink density range in the print design according to the instructions can be used in any ink overprint sequence, namely YMC, YCM, CMY, CYM, MCY or MYC. But does every sequence in the print design produce the same color? Actually not, even when the solid density is controlled to an absolute value, each overprint sequence in the print design will produce different overprint colors of red, green, and blue, because the printing ink formula on each print design has different properties, such as influence The ink opacity of the coverage rate. Therefore, the surface energy of the ink drying film layer printed first (print design) will affect the adhesion characteristics of the wet ink printed later (print design).

Yellow pigments have poor coverage, and magenta and cyan pigments have good coverage. But the surface energy of yellow pigment ink is high.

The first step in color management in print design is to determine the best ink overprint sequence and density balance that can provide a high color rendering range.

For example, the three corners of the hexagonal color diagram that are not adjacent to each other are the ideal primary ink 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 color strength of the ink, the closer to the corners, the farther away from the neutral color.

The GATF Association developed a simple color hexagon color map many years ago to visualize the ratio of different colors. The density meter can display the quality of the color by measuring the hue deviation, gray scale and overprint color and compare it with the three primary colors.

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