Output preflight software application discussion

It is believed that every reader who works as a prepress producer will have a lot of unsuccessful output. By the end of the day with an output machine and a raster processor, it was one day eleven years ago for the author. Raster processing of files has always been a nightmare. When a file is sent to RIP, which is no matter how expensive and precise, it looks like you are looking at the output signal as if you were buying a horse bet. But even if there is a film output, please don't be too happy. Check the film carefully to see if it is something that can be printed high. In addition, we must also look at the output, is not what you or the designer expected. Summarize three key issues:
1, how to ensure that the output is the input design;
2. The printability of the output part;
3, RIP calculation error output is equivalent to the concept of input - electronic film In order to avoid unnecessary output calculations of the changes, I suggest that you adopt some foreign experience, turn to use some of the more stable output electronic file format, so that the file Designers from the file production to solve this most basic headache. First understand the problem from the source of the problem. One of the most important functions of RIP raster processing is to use the design file of the low resolution desktop to calculate the precise high resolution dot matrix output file available. Therefore, the TIFF-1bit or TIFF format is the most secure, and the high resolution PDF is safer than the PS format. TIFF-1bit is more suitable for printing applications, and PDF/X is an ideal choice for cross-plant cross-regional use. In the United States, PDF/x-1a and SWOP standards are popular as the industry-wide format, while Europe uses the PDF/x-3 format as the recommendation. The author tends to suggest that the industry consider adopting PDF/x-3. If the print designer can provide PDF/x-3 files to the output department. Basic output discrepancies can be avoided. But the problem is that generating PDF/x-3 files requires a lot of basic printing knowledge. In fact, think about if anyone also said that they can produce PDF files for output printing. It's better to ask him to seriously think about it before exporting an industrially approved file.
Testing of the printing requirements of its software as a pretest is not a fresh product. The earliest piece of preflight software I knew was already a product of ten years ago. The problem is also due to the use of operations, there are many settings that require the user to make a decision. For example, young line protection. If there is a very young line in the document, how can the output colleague decide how young he can not print? And what if the customer insists on output?
But do not think that pre-examination is useless. Here, most preflights can also normally check for printing-related conditions such as lack of picture resolution, OPI missing picture, or abnormal separation and spot color processing, ie, four-color separation of five colors.
The author suggests that the processing output colleagues make good use of these benefits and conveniences to ensure the most basic printability. The reference function is as follows:
1, trap leak detection;
2, trapping treatment, young trap protection;
3, young line fine character detection;
4. The confirmation of color separation, four-color or spot color processing;
5, image resolution detection;
6, OPI function detection;
7, page size detection RIP grating calculation pre-check Finally, still face RIPPING grating calculations. The reader must first understand that any format generated by software will have the so-called Header and Content points. Header is only a part of the description of the record, the real content is still in the Content, such as fonts and fonts, Header will explain the font used in the text and whether there is a font, but the fact is there is a band is calculated from the Content of. Most of the pre-checking software in the market is just a description of the detection of the Header. It is not really a matter of carefully checking the Content section of the file. Sometimes, even if it passes the test, it is still an error in RIPPING. Because of the increase in computer computing power, there are two companies on the market that provide pre-check software. The pre-check method is to simulate RIPPING, that is, they do not look at the header of the file, but directly calculate the file to see if there are any problems. Of course, these two softwares require computers with higher capabilities to operate, but they are really the safest preflight software.