Research on the application scheme and technology

2022-08-18
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Research on the application scheme and technology of simulation proofing of digital proofing machine (I)

digital proofing machine is now more and more widely used in digital workflow to provide accurate printing effect simulation output for printing customers and printing process. We can divide the simulation output into the following common application forms

1. Use standard proofing environment (special proofing paper and ink for specific models) and frequency modulation mode to simulate the effect of proofing under various printing conditions (such as the effect of paper, coated paper, etc.)

2. Under non-standard proofing conditions (such as using coated paper and whiteboard instead of standard proofing paper, etc.), the same simulation proofing effect is similar to that under standard environment

3. Use the advanced method of imitating the printing amplitude modulation point to simulate the printing effect

however, in essence, its key control technologies and techniques can be summarized into three aspects discussed in this paper

linearization and characterization of the proofing machine

whether standard or non-standard proofing conditions are used, the proofing machine must be adjusted and calibrated before simulation proofing. For a specific combination of paper, ink and resolution, the nonlinear relationship between the original drive value (input value) and output value of the proofer is sometimes very strong, and the experimental stroke is small, as shown in Figure 1. The key factor in the printer calibration process is to make this nonlinear relationship compensate for the linear relationship in the output effect. The common mechanical properties and stable working state of the following materials. This is the basis to ensure the proofing quality and effect of numerical documents (such as gray balance, hierarchy, etc.). According to the level of the system used, it can be divided into professional level and driver level

1. Linearization and characterization of professional proofing system

taking best proofing software as an example, the main contents of linearization are as follows:

(1) basic linearity: under the condition of contract quality, generate linear adjustment for specific proofing paper, ink and resolution combination

(2) judgment and setting of optimal ink volume

(3) printer linearity: linear correction and fine adjustment of printer status based on basic linearity, which is a fine adjustment "button" for proofing input, especially uneven dispersion

as shown in Figure 2 (1), it is the printer linear detection interface in manual mode. Use a colorimeter to measure and input the whiteness of the paper, the field density of each ink color and the linear color code (including C, m, y, K), that is, to form a printer linear file. Figure 2 (2) shows the ink volume visual test proofing target, and the total ink volume is determined by the absorption and overprint effect of the proofing paper

as shown in Fig. 2 (3, 4), the characterization process uses the linearized proofing machine to output the standard, such as it8 CMYK output color code. Then we must use the help of colorimeter and professional color management software such as profilemaker to establish the so-called "paper profile" of the current proofing machine, and this software and hardware system is more expensive and can be outsourced. Figure 2 (5) shows the parameter setting interface of the best proofing software. It is necessary to set the above paper profile, basic linear, printer linear generated files and ink volume parameters into it to form a certain output control

2. Calibration and characterization of driver level

without the support of professional proofing software, Indian Prime Minister modi has been invited to use the adjustment parameters of the proofer's own driver to adjust the effect feedback in the way of visual comparison, which can achieve a satisfactory output effect. However, due to the large space, it is not discussed in this article

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