Proofing common sense that beginners should understand

Proofing common sense that beginners should understand

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Currently, the mainstream of domestic offset printing is the CTF (Colorploter To Film) process. Most offset printing companies have achieved full digitization in the middle of the process. How to digitize proofs to shorten the cycle and reduce costs is a topic of great concern.

First, here are a few ways to proof.

First, there is film proofing (analog proofing / traditional proofing)

1. Printing machine proofing. Its advantages and disadvantages are obvious. The advantage is that the complete printing environment maximizes the proof of the sample; the disadvantage is that the cost is too high when the printing machine is wasted.

2. Proofing proofing. This method basically reaches the printing environment, the proofs are basically the same as the prints, and the cost is moderate, so this method is now the most widely used and most easily accepted by customers and printers.

3. Transfer proofing. For example, DuPont's Kromalin proofing method, after outputting the film, transfers the dots onto the paper through the color film. This proofing method is faster, and the color and level are close to the printing effect. According to the data, this type of proofing has a market share of more than 60% in the North American market, but it is rare in China due to various reasons such as consumables costs.

Second, no film proofing (soft proofing / digital proofing)

Filmless proofing is functionally divided into three categories:

A.Design Proof, mainly for layout design;

B.Color Proof (color proofing), mainly concerned with color reproduction effects;

C.Screen Proof not only cares about color reproduction, but also cares about the effect of dot reduction.

Under the same format conditions, the hardware investment of Class B is much lower than that of Class C. Offset plate making companies mainly choose Class B digital proofing (Color Proof).

Filmless proofing is divided into the following categories:

1. The screen is soft proofed. Pre-check on the display by color correction of the display.

2. FTP remote proofing, this method with the development of Internet technology, the increase of communication bandwidth, the further improvement of color management technology, will become a development trend (at least at the level of proofreading).

3. Digital proofing. The commonly used digital proofing is inkjet and laser (of course, there are sublimation, thermal transfer, hot wax, etc., and proofing by laser imagesetter and direct platesetter is also a method). Digital proofing is now developing very fast and will become the dominant way of proofing in the near future.

The purpose of proofing is mainly the following three points:

1. Communication with customers: For a professional plate making company, proofs are its finished products, and customer signing is the end of the entire plate making process.

2. Communication with printing: Only after the customer signs the sample, can it be printed on the machine. The printer captain needs to adjust the printing environment according to the sample.

3. Film inspection: The quality of the film can be thoroughly checked by the sample.

Digital proofing is a key part of the CTP process. In the early stage of the promotion of commercial printing to the CTP process, digital proofing is generally divided into contract proofing and layout proofing.

For cost reasons, contract proofing generally chooses A3 format color laser printer or small-format Scitex IRIS series as color reproduction; layout proof selects A0 or A1 format low-precision inkjet printer as the approval of layout text. For customers and printers, these proofs are not very suitable.

In 1999, Epson launched the Epson Stylus Pro 9000 series and the 2000 Drupa launched the Epson Stylus Pro 9500 series of high-precision large-format inkjet printers, combining contract proofing and layout proofing, and the machine hardware investment is not large. It has become the main model of current system integrators.