How to control digital printing colors? How can I get a good color reproduction effect on a digital printing machine? "This is a fine balance problem", according to Mr. Doug Polarkowshi, a technical expert in UARCO's printing department, "In order to explain the toner problem on paper, I let the customers Recall a game often played by children of the older generation, which is to rub the balloon on the hair and then stick it to the wall. This game is easier to achieve than the summer when the weather is dry, and the fall of the toner is also This truth. " Next, the technician created several test files that included colors and textures (like gems, skin tones, neutral grays, etc.) that were difficult to replicate. Finally, after linearizing the device, they calibrated the color scale under white light. Now, the manufacturer provides the company with many tools to help them solve this problem. Agfa now offers "second versions" of three types of Chromapress consumable materials (toner, developer and imaging drum), mentioned by Agfa's product manager. Agfa emphasized that in order to avoid the expiration of developer, they already have a routine maintenance procedure. Moreover, the Chromapress device can perform color registration and color density adjustment through the server, and can be randomly adjusted, and the adjustment can occur on the printed parts of various colors. The thoroughness of this kind of work hopes to get results from IBM. Mr. Chrisparker, the business manager of IBM ’s color printer products, mentioned that the company spent nearly a year testing 10 identical Xeikon printers before releasing their InfoColor 70 product. “We try our best Find the largest area of ​​change in the display effect with the device. The results clearly show that the problems caused by calibration, printing materials, or any other changing factors are much smaller than the problems caused by the actions of the operator only. The software may just change in the registration problem, and many operators may make several changes, which results in a lot of waste. "Mr. Parker believes that this trend mainly comes from the operator ’s experience in offset printing. At any time, as long as the equipment is turned on until the colors on the ladder look good, it is fine. But for digital printing machines, it is not suitable. " Interestingly, Mr. Parker claimed that the color and press control issues in the digital printing of business card printing in Shanghai are basically the same as those in offset printing. "For example, for a former offset printer, the adhesion of toner is no different from the ink-water balance in offset printing. Cylinder voltage-has a great influence on digital color reproduction, a bit like the pressure of a rubber roller. On a digital press LED exposure can be compared with plate exposure, "he suggested. IBM's long-term workflow analysis of InfoColor 70 before use has enabled Agfa to include fully automatic density measurement technology in their products. This product is also equipped with a built-in heating head (to improve humidity and temperature control) and a Gretag Density meter. The latter device is connected to the server, and as long as needed, it can prompt the color value of the coding job. Moreover, InfoColor 70 also provides: SWOP used in order to achieve automatic color matching and the color lookup table extended by European specifications. Mr. George Willock, President of ColorStream, is very proficient in InfoColor, a digital market development company that has sold 650,000 copies of the copy program in 90 days. Hollis is a digital printing company with 25 employees. Mr. Krebs said that the biggest difficulty now is to match the color reproduction of early-printed or reprinted prints. The company keeps samples of all jobs to help visual matching. "Sometimes, our operators can even accurately remember how a job is printed. However, more systematically, Krebs employees have formed some operating procedures: calibrate the equipment every day, Shanghai print its own color Standard control page, and careful density measurement technology (to ensure that the device will not be over compensated). If the color problem still exists, by outputting 3-4 proofs, "we will adjust it on the printing press." If this still does not work, Mr. Krebs said that they will go back to PhotoShop to adjust the files. Rarely is a mechanical problem, it is best to leave it to the printing staff to solve it, he suggested. With the output of Xeikon-based equipment, if it cannot be maintained properly, the developer may fail, just like the plate wear in the production process of Indiog (the voltage will decline). Mr. Mike Chiricuzio, a longtime user of E-Print 1000 and the general manager of Sequel Inc., said that he is happy to have a new upgrade in his front-end software, which can synchronize the life of the printing plate and automatically perform change calibration. In addition, for Sequel's more than 700 customers, the Indigo system can store density settings for each job to ensure color stability.
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