Necessity and feasibility of color
necessity
Pre-press proofing is an indispensable task in the printing process. The timeliness and stability of traditional proofing are flawed. The appearance of digital proofing properly solves this problem.
What are the difficulties of digital proofing?
The imaging principle of the inkjet printer used in digital proofing and the printing equipment are quite different, resulting in poor color consistency between the printed sample and the printed product. Therefore, the color control (following color) of digital proofing is particularly important in the whole proofing process, and the implementation process is also more complicated.
feasibility
Digital proofing is necessary, and the implementation process is more complicated. Is it feasible to simulate the color of the printing press by adjusting the output color of the printer?
The answer is yes, of course, if you want to achieve a better color, the prerequisites are indispensable.
Follow color method
The premise of color
The printing equipment is relatively stable. If the object of our color changes frequently, this color is worthless. In the actual application process, the stability of the printing press is affected by many factors, and some adjustments are more difficult, so the stability of the printing press is only relative, as long as the difference between each printing is not great.
We can only use inkjet printers with good stability and easy adjustment to simulate the color of the printing press, so as to achieve the purpose of following the color.
Method one: adjust the printing color according to the printing sample
If the printing factory only provides us with printed standard proofs, how should we follow the color?
In the RIP software that controls the printer, by adjusting the inkjet volume of the printer and multi-color linearization data, print out a sample sheet close to the printed product, so as to achieve the purpose of following the color.
Generally, the ink volume control in the RIP software is divided into two parts: single-channel ink volume control and superimposed total ink volume control. The two ink volume control methods are explained below.
Single channel ink volume control
First print the standard color patches that adjust the single-channel ink volume:
Use a spectrophotometer to read the printed color blocks into the software. Some RIP software will automatically select the maximum amount of monochrome ink. However, in order to simulate the color of the printing press, we must manually select the one that is close to the printed monochrome Print monochrome ink value.
The RIP software that controls the printer provides control strips for monochromatic ink volume control, corresponding to a variety of monochromatic colors. Compare the single color in the printed product and the printed color block, and select the corresponding value according to the ratio.
Superimposed total ink volume control
Print the total ink volume control color patch. The upper half of the color patch is used to measure the automatically generated total ink volume value. The following is used to visually select and select the corresponding value.
In order to better simulate the color of the printed product, here we also need to manually select the total ink volume, and select a set of superimposed colors close to the overprint color on the printed sample as the limit of the total ink volume.
2. Multicolor linearization control
The linearization of the RIP software is automatically calculated by the software, but here we need to follow the color, so when you complete the automatic linearization, there is still a phenomenon of poor color consistency, we can use the manual modification of the linear parameter pair The output color of the printer is further adjusted.
If you need to modify the linearity to achieve the purpose of color follow-up, it means that our printed samples have a certain degree of color cast. After adjustment, the printer will also have a similar color cast. These color casts will be clearly reflected in neutral gray and other superimposed colors on.
The RIP software linearization adjustment interface is similar. Compare the printed and printed proofs to select the color to be adjusted and fill in the corresponding "input, output" value to adjust. You can also click a point on the curve to pull up or down to modify.
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