Digital proofing principle: choose a suitable system for proofing

What kind of proofing system is used for what purpose

To correctly evaluate and select a system suitable for a specific application, the most important thing is to understand what kind of proofing capabilities the market can provide, and to understand the accuracy, production conditions and advantages of various digital proofing technologies required by customers defect. There are currently three levels of proofing, each of which has different performance requirements for different print qualities.

1. Final proofing

Final Proofing (Binding Proof) is the fastest-growing proofing method in terms of technology and products. Printers can rely on it for reliable and precise purposes. It can maintain absolute accuracy in data collection, image quality and color matching. Accurate and stable. At the same time, it is also a reliable production tool.

2. Proofing before printing

Prepress Proof can be used to check the technological process and production process. With the permission of color and image quality, pre-press proofing can also be used to check parameter settings and set-up position like final proofing.

3. Copy proofing

Copy Proof (Color Proof) is a color proofing performed at the initial stage of the production process, this stage only requires the color of the proof to reproduce the design. The copy proofing just makes the design visible.

Digital screening proofing system

The use of digital screen proofing for final proofing has already begun, and the car is growing at an annual growth rate of 20%. This growth stems from its quality, flexibility, and stability that exceed traditional analog proofing, and has more interfaces and more open processes.

Does the tone range of the proofs correspond to the printed sheets?

There are two important basis for distinguishing different digital screening proofing systems, and they are particularly important for the final proofing. The first basis is the ability of the proofing system to reproduce the entire tonal range. The tonal range that CTP can handle is wider than the tonal range of printing. When the CTP system is used normally, the printer can maintain normal operating parameters. To prevent the loss of 1% to 2% of the dots, the most important thing is to choose a proofing system that can stably reproduce such high-gloss dots.

Does the expansion of the proofs correspond to the printed sheets?

The second important basis is how many dots have expanded compared to printing. The expansion of additional dots in the simulated proofing is predictable, as long as the tone curve is properly adjusted, it can be excluded. Although dot expansion is easy to control in practice, optical (visual) expansion can still cause printing difficulties. Some analog proofing systems will cause an overall expansion of more than 25% in the mid-tone region. More than 60% of this expansion is due to optical expansion.

This situation is difficult to change in analog proofing. Unfortunately, the same problem exists in some digital screening proofing systems. Although, some adjustments can be made by adjusting the mechanical network expansion. However, this control is very limited in strict highlights and mid-to-high-profile parts. On the other hand, when the optical dot expansion of the proof is small, it can naturally match the printing conditions without changing the tone curve.

Configure digital screening proofing system

There are several key factors to consider when choosing the final proofing system:

1. Network structure

The market definitely needs economical screening proofing, because screening proofing provides the best process control method and simple and easy printing machine adjustment method. It has been reported that printing screening can save 30% to 50% of preparation time due to the use of screen proofing to make intelligent decisions. Therefore, users often no longer accept the continuous proofing as the final proof.

2. The number of network cables

Most of the current proofing systems on the market are mechanically restricted in the angle of the mesh that can be proofed. When choosing a digital screening proofing system, the most important thing is to see whether this system can reproduce the mesh angle and dot structure used in the production process, including ordinary dots and FM dots.

3. Consistency

The correct final proofing system must be able to provide consistent proofs. Even in different production locations, the output proofs should be able to reproduce the same color, and must use only minimal color management and operator intervention. To establish this consistency, the color correction between jobs must be very stable and there is no need to recalibrate frequently. Standards for color correction In order to ensure the high accuracy of the final proofing, the digital screening proofing system should be able to select a variety of industrial standard color systems, including SWOP, GRACol, European color standards, Japanese color standards and Pantone six color systems. The ideal system can also provide pure pigment inks and special inks, such as metallic inks and opaque white inks.

4. Pigment ink

Digital screening proofs using pigment inks are better than dye-based proofs. Pigment inks are more stable and brighter and will not catch up quickly. In addition, since pigment ink can also be used in printing machines, it can achieve more accurate color matching.

Network expansion It is necessary to study the network expansion of different digital screening proofing systems in order to determine the minimum value of network expansion, and determine the influence of different coatings and coatings on the network expansion value within the acceptable range. Make sure that the proofs match the printing effect after CTP plate-making and have a smaller dot expansion like traditional printing. The proofing system should be able to reduce the expansion of the dots to a minimum, make it as close as possible to the final printing effect, and maintain 1% -3% of the dots.

5. Paper

Proofing on official printed paper can usually get more authoritative proofs. Digital screening proofing system through its image processing very close to the printing process, the copied sample can better predict the subsequent printing results. Proofing directly on the paper allows users to see the printing effect on different grades of paper.

The digital screening proofing system of the production process is not only a peripheral device, but also an integral part of the production process. Such an option should be provided, through which the digital screening proofing system can be set up as a network printer or directly connected to the existing RIP to connect the system to the existing front-end system. , Harlequin Script Works, Scitex Brisque, Heidel berg Prinergy, etc.

The final proofing is undergoing a tremendous change, and the digital screening proofing system has accelerated this change in work practice. Choosing the right digital proofing system is the core issue that needs to be decided for the survival and profitability of the enterprise. Make sure that the digital screening system on the market meets your strict requirements. If you make the wrong decision, it will reduce the output and quality of your product; if you make the right decision, your CTP system will release its full potential

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