The commonalities between digital proofing and CTP technology are obvious. Digital proofing directly outputs proofs from digital files, eliminating the tedious link of film, printing and printing on the middle; and CTP technology directly outputs printing plates from digital files, also eliminating the need for film and printing. Whether it is digital proofing or CTP technology, it starts from a digital file and directly reaches the final result. What keeps the two together is a digital pre-press file that remains unchanged throughout the process.

But the words are simple, but they are far from being so simple. First of all, although the digital files are the same digital files, the output devices are different, and the output content is also different. Digital proofing equipment directly outputs color proofs to form color images; CTP equipment outputs printed plates with color separation dots. The two have different color gamuts, different forms, different materials, and different imaging principles.

In addition, the plate material exported by CTP is still a transitional product, and it needs to be printed on the machine before it can be converted into the final printed product. The transmission of the image information in the middle is difficult to achieve 100% consistency. Therefore, even if the color content expressed by the image information of the printing plate is completely consistent with the digital proof, the effect of the printed matter must be completely matched with the color proof of the digital proof , Its difficulty is very large. This is also the industry's most troublesome proofing and printing mismatch.

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