A few days ago, we released the article "Technology | From dozens of printing enterprise certification experience, Fogra certification experts summed up the color calibration method (one)", the paper mentioned three methods of color calibration:
——matching dot gain curve
- Calibrate the gray balance
- The method of directly converting CMYK using CMYK.
All three methods have their own advantages and application scope, and they all have their own limitations. See Table 1 for details. In practical applications, it is necessary to combine and analyze the printed matter to control the color quality in the production process more effectively.
Here, we will talk about method 2 and method 3 of color calibration.
The second method of color calibration: calibration gray balance
The gray balance mentioned here is the non-color tone achieved by overprinting the CMY three colors at an appropriate dot ratio over the entire tone range. If it is biased toward a certain color, it is considered to be out of balance.
G7 clearly defines the calculation method of gray balance, which is related to the substrate material. It also defines the percentage of dots of each color when reaching the gray balance, and designs the corresponding test chart P2P. After the development of P2P23 and P2P25, it is more suitable for large-format spray. The latest version of the ink color calibration P2P51 (shown in Figure 4) has also been introduced.
In addition, G7 also defines the gray tone, the density of the tone is determined in density, that is, the neutral printing density curve (NPDC), the horizontal axis is the percentage of the input dot, and the vertical axis is the printing density value.
The NPDC is divided into two pairs, one is the density curve corresponding to the three-color ash composed of CMY in the fifth column of P2P51 (Fig. 5a), and the other is the density curve corresponding to the single-color K in the fourth column of P2P51 (as shown in Fig. 5). 5b). In fact, it reflects the tone reproduction characteristics under different field densities.
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