Now the pre-flight is not related to the aircraft. In the printing industry, it refers to the pre-printing pre-printing work. In the CTP machine, it is to see what is wrong with the document before output. But why do we pre-fly?
In 1997, GATF (American Printing Technology Foundation) conducted a survey on common problems in digital files, and found that 85% of digital manuscripts provided by customers had errors. There are usually some problems in digital files: missing characters, missing images, incorrect colors, incorrect scanning mode, improper page settings, incorrect bleeding size, incorrect trapping, and low or high image resolution. Many customers admit that they are accustomed to making documents with software such as Word or PowerPoint, and printing documents on their inkjet printers. They are not familiar with, nor are they used to using professional typesetting software such as PageMaker or Quark, and do not understand how to make documents according to printing requirements. . In addition, some printing customers can easily change the printing requirements in the middle, which is also easy to cause rework of printing plate production. In this case, the error correction of typical printing jobs becomes a very time-consuming task, and both the customer and the printer have to negotiate to resolve it.
Most pre-checks can also detect problems such as insufficient resolution, lack of OPI images, color separation, and spot color processing. Therefore, in order to ensure the reliability and stability of printing, the following functions should be pre-checked:
1. Leakage detection;
2. Trap processing, protection of young line trapping;
3. Detection of fine characters of young lines;
4. Confirmation of color separation, the four colors are still treated with spot colors;
5. Picture resolution detection;
6. OPI function detection;
7. Page size detection.
Only after pre-flying, can we avoid the problematic CTP version, so we must pre-fly before printing out.
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