Offset printing image color control technology(two)
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4 density value color control method
However, there are other ways. Attracting attention from George Stewart, such as Polestar, QuebecorWorld, and Scotland, is Germinate's Press Signature product. Printed to the target density value and then measured the tone on the signal strip, the Press Signature software not only provides dot gain, but also provides the reason why incorrect dot gain occurs on a particular print job and gives Suggested corrections. Once properly calibrated, the dot gain curve is set to the ideal location to allow the printer to print a print of predictable quality at the correct density. All measurement work only has the position of the signal strip. With the help of Harlequn RIP, all data transfers are automatic, which saves the tedious task of typing data.
The system supplied by NCS to George Stewart ensures that all presses, regardless of their age, can be printed with the same quality. This allows a job to be dispensed to different presses with a short duration without compromising print quality consistency. Regardless of the printer model, location and culture used for printing, the printed structure is identical. Some vendors say their goal is to replicate data in real time, real-time inventory and usage control, so they chose to install Press Signature on their presses.
The attitude of the production department manager of some companies to this Press Signature system can be described by the word "ecstasy". Especially for those who need to print the same kind of products in different places around the world, in order to ensure the reputation of the printing company and customers, it is necessary to control the image quality. They believe that this system is a collection of quality control.
Canon built the Press Signature into a website so that the printer can view the test strip data recorded by Press Signature. The purpose of this is to generate a graph showing the expanded area of the dot relative to the ideal target and to provide feedback to the press via software feedback. Once the proposed corrections are entered or modified, the plate exposure system will compensate the press and the curve will return to the desired state. Any changes made will be reflected in the feedback to the website.
Whether the presses are in any part of Europe, if they all use this system, then they will all get the same high-quality printing effect, which ensures that Canon's print quality is measurable. Soon, printers that print products for Canon must have this software system.
And the software is an opportunity for small printers or remote printers. Once they have adopted the system, they set up a standard process for objectively assessing print quality so they can print high quality. The product. This objectivity is the key to the control of the printing process. Any operator who makes adjustments to the press using visual evaluation can only get subjective changes. This change may be visually better, but it actually has many other problems.
For example, if magenta's dot gain is too small, the printer will compensate for more magenta ink, but in reality it may get a "dirty" color. Conversely, printing based on quantified data eliminates subjectivity issues. With this system, complex density calibration and subjective evaluation can be avoided, and the color appears to be more "clean", and the printable color tone is also greatly expanded.
5 rotary offset printing image color control
At present, the color quality control methods and effects of the single-plate lithographic printing presses in China are quite mature, but relatively speaking, the printing quality control of the rotary printing press is relatively lagging behind. As people's requirements for the quality of printed products continue to increase, the corresponding color quality control methods and methods must also keep up with the requirements of the times, which promotes the research, development and use of color control systems for rotary presses. The appearance of the Closed Loop Color Control System has made the printing quality of the rotary machine well solved. Since the first generation of closed-loop color control systems debuted at Drupa 95, it has been estimated that more than 300 have been sold so far. About 62% of the original rotary machine was modified, and the remaining 38% was installed on the new rotary machine. Of all these machines, print printing accounted for 49%, followed by commercial printing, which accounted for 29% of the total. Through investigation and analysis, the closed-loop color control system not only can improve the quality of the rotary printed matter, but also can improve the efficiency, save the preparation time and the waste of pre-printing, and can use and distribute the laborers more rationally, so as to maximize the benefit of the printing enterprise.
The closed-loop color control system is relative to the originally widely used open-loop control system. The open loop control is in the state where the printing machine is continuously operated without stopping the machine, and the operator periodically or irregularly takes out the printed matter printed on the printing machine and puts it on the console, and then uses the instrument to measure or visually judge the printing quality, and then judge the printing quality. Various adjustments are made to the press for different situations. The closed-loop color control system continuously scans and calculates the color test strip on the moving substrate through the imaging device, and feeds the data back to the center console of the printing press ink to adjust or correct the thickness of the ink layer. At this point the press remains in continuous operation, and all testing and adjustments are done automatically by the machine without subjective intervention by the operator. In addition to maintaining color quality consistency, the system provides an efficient method for real-time data collection for statistical process control and customer quality assurance.
6 Adaptive neural network combined with color difference color control technology
The principle of adaptive neural network combined with color difference detection for color control of offset printed images is mainly based on two considerations: 1) Adaptive neural network has self-learning, forming a closed-loop control structure in the offset printing process, making it at high speed. In the printing process, the printing machine can be adjusted and maintained in an optimal state in the shortest time to avoid waste and affect the construction period. 2) The color difference is a device-independent color measurement index, so the established adaptive nerve can be made. The network color control model can adapt to various printing models and substrates, and improve the adaptation of color control technology. Currently, this color control technology is under study.
7 Conclusion
All in all, printing under the same standards can improve the quality and consistency of the print. If done properly, you can waste less and reprint. From the current user feedback using this system, there is nothing more doubtful about this.