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The quality of printing depends on effective color management.
If a color box is printed in multiple, multiple locations, on multiple devices around the world, how can we maintain the consistency of their quality?
Release Time:
2021-11-09 10:29
Source:
If we print a color box in one printing factory, maintaining the same quality is relatively simple. However, if a color box is printed at multiple locations around the world, on multiple devices, how can we maintain the consistency of their quality? Therefore, to ensure the quality of printing from each batch and on each device, we must adhere to standards.
Many factors affect the final color of printed matter, such as different printing platforms leading to different color reflections; different color management formats of electronic files provided to printing service providers will also affect the final print color. In addition, the dot gain rates of various printing presses vary, the quality of output from each company is inconsistent, different brands of inks have different color gamuts, different papers are used, measurement instrument settings differ... all of these will affect the final result.
I. Color Conversion Platform
When customers give us RGB files that need to be converted to CMYK, what methods do we use for conversion? If the standards used by each company during the conversion process are different, will the colors of the converted CMYK files be consistent? Similarly, even with the same file, the printed colors can be different using various printing methods such as digital printing, offset printing, and gravure printing. So, how do we unify and solve these problems?
At the 2009 International Print Standardization Forum, X-Rite introduced the concept of CxF, which stands for Color Exchange Format. CxF is an HTML-based language used to describe the conversion of a color between different platforms. Its emergence helped us solve the problems encountered during color conversion. As long as you define the file correctly, the resulting color will be consistent. Currently, the CxF file is already embedded in the PDF/X-4:2010 files we use. This means that when we receive a PDF/X-4 version file, it indicates that it can be freely converted across many printing platforms.
II. File Conversion
When the manuscript source reaches us, what is the total dot area determined during color separation? What type of screen ruling did we adopt? Did we use trapping and UCR/GCR? Because different total dot areas may affect the final printing effect, and different screening technologies result in different dot gain rates for different screen types. This means that, ideally, if Kodak's CTP equipment cannot work today, when you use Heidelberg's CTP for output, there might be a certain difference in the final printed colors. These defects cannot be compensated for at the printing stage.
III. Device Differences
The printing process is extremely complex. Not only does ink-water balance matter, but differences in consumables and substrates can also significantly affect the uniformity of the final print quality. The factors mentioned above are all visible and well-known, but there is also a potential, often overlooked, factor in the printing process: the dot gain rate of the equipment.
In fact, the dot gain rate of printing equipment in every printing factory is different. This means that even if you are given the same set of plates, the same substrate, and consumables, printing on different presses may not necessarily yield similar prints. How can this problem be solved?
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