Today's InstrumentFlight using Brunel system can relatively easily evaluate the quality of printed products. Scan the spectrometer to measure the printed control strip, store the data, and calculate the best color correction value based on more than 30 offset printing parameters. After comparing and analyzing the printed products with the stipulated standards, the number of stars is obtained. The more stars, the better the quality (up to 5 stars).
In fact, this technology has been integrated on the Manroland sheetfed offset press for quality control. This technology is combined with QuadTech's online measurement and adjustment system, and is also used in web offset presses. Therefore, the time and material consumption on the printing machine can be greatly reduced, and the ink color can be kept stable during printing. In general, in order to control the quality of the final product of offset printing.
ProofChecker is an inspection software that was installed and used for the first time in a printing factory in Switzerland in October 2006, and it is a supplement to InstrumentFlight. The software is first used during the digital proofing phase. The printer can use ProofChecker software to determine whether the provided print data is within the specified standards and whether it can be calibrated without problems at the beginning of printing.
In addition, it does not matter whether the output device uses electrophotographic toner or inkjet printing, with or without dots. Therefore, the target group of ProofChecker software is not limited to offset printing plants, digital printing plants also use this software in order to improve their printing quality.
1. Digital printing
If it is said that the comparison of different digital printing technologies has so far been mostly visual, then for the first time the measurement technology of the "Brunal System European Standard" is used for comparison. According to the company, today's industry standards show the most precise characteristics of standardized offset printing.
This aspect mainly uses ProofChecker software to analyze and evaluate the digital printing system. In addition to the software, the proofing zebra control strip? Free download on the Internet is an important part of the inspection system. With this zebra strip, you can collect all the parameters of the offset printing according to the Brunel European standard system, although the proofing is using netless inkjet printing. of. The zebra stripe is a measurement and control strip, which is composed of 20 steps of 5% to 100%. However, the zebra stripe is always arranged alternately with the measurement color blocks below 50% and the measurement color blocks higher than 50%. Therefore, a contrast that is sufficient for automatically identifying small measurement patches is generated.
Proofing zebra stripes are measured using a scanning spectrometer. The software analyzes and evaluates more than 50 parameters based on its color impact on the image, and uses 5 stars to evaluate the quality similar to the design of InstrumentFlight. Uniform gray balance is the best quality.
Users of different proofing systems use ProofChecker software to confirm that they can agree with offset printing standards in any case. It does not matter whether it is an inkjet system or a toner printing system. Whether the color particles of the printed image are made up of amplitude modulation nets, line nets, frequency modulation nets, or colored toner solids, these do not matter to the measuring instrument. There is no need to worry about formulas and algorithms integrated in the software.
2. Check 7 digital printing machines
In the series of tests, two sets of A3 size Brunner system test versions were printed on 7 digital printers of Canon, HP Indigo, Konica Minolta, Kodak, Océ, Secco and Xerox. The test version consists of different measurement components, proofing zebra strips and strict test images, which were subsequently evaluated by a company in Locarno, Switzerland, using ProofChecker. The evaluation results show that the digital printing systems of various manufacturers have basically reached the level of European offset printing standards, but all printing systems also have deficiencies. According to the evaluation of European standards, some printing systems still have obvious visual deviations from offset printing.
3. Uniformity of gray balance
This mainly involves a more or less zigzag tone value curve, which is too high or too low compared to the offset curve, or very far apart. When the uniformity of the gray balance shows a defect? ​​The tone curve does not change. The "uniformity of balance" shows how inconspicuous the gray balance reflects in the entire range of tone values. The gray balance measurement section with 20 brightness steps is collected and analyzed by the brightness curve in the new measurement composition, and converted into chromaticity measurement, which is displayed in the Brunner hexagonal system. 20 measurement points are used to display and evaluate the deviation of the neutral gray axis.
4. Check the official printing quality
In addition, from the continuous printing of 100 copies of each digital printing press, the process changes are analyzed and compared with offset printing. The results show that the process changes are also related to machine adjustment and maintenance. Overall, offset printing now shows the best process stability.
Whether the effect of the digital printing system can be improved depends on its front-end and terminal systems and the possibility of intervention in ink color and printing control. Professional digital printers can perform this kind of intervention in terms of tone curve, maximum density and other adjustments, and can quickly reach higher quality levels.
5. Integrated measurement
Now some digital printing system manufacturers have integrated measurement control technology in their printing systems. It can automatically balance the measurement results of rated values ​​or maintain the stability of parameters in digital printing systems, such as temperature and air humidity. The Brunel system and integrated calibration technology can improve the quality and can be consistent with offset printing standards.
As can be seen from the development process of ProofChecker software, web offset printing manufacturers using QuadTech / InstrumentFlight software have accepted the European offset printing standard of Brunel system. In addition, according to Brunner Systems, users in Germany say that because of the large tolerances of the offset printing process standards, they are helpless about this standard. However, digital printers are interested in Proof-Checker technology.
Offset printers and prepress companies can not only calibrate their proofs to offset printing standards, but also calibrate their digital presses.
Digital printing plants can objectively check how their printing results are close to offset printing standards, optimize print output, and solicit customers.
Lipstick and Lip-brush for Phoenix Beauty,Lipstick Hazel Lush ,Cosmetic Lipsticks for women, Makeup Cosmetics
SHENZHEN MERRYNICE COSMETICS CO., LTD / MERRYNICE COSMETICS USA GROUP , https://www.merrynice.com