Digital proofing has been developed along with the development of CTP direct plate making technology and is an indispensable part of digital workflow. Of course, digital proofing is not limited to the specific part of “printing proofsâ€. It is a specific application of the core technology of color management. It is based on color management and cannot be separated from color management technology. This article combines EFI digital proofing software to describe the color management process of the printer, which can match the proofing and printing.
First, what is digital proofing?
Generally speaking, the publisher or other customers only officially start printing the printed materials required by the customer after receiving the proofs provided by the printing company and signing the confirmation. In this process, the process of making a printed sample by a printing or proofing company based on a film or electronic document provided by a plate-making company is called proofing. The customer checks the layout design and print quality of the printed samples and signs that the sample can be used as a basis for printing. This process is called signing.
Digital proofing is based on the color range of the printed color and the same RIP data as the printed content. The digital proofing device is used to reproduce the printed color, and the proofing process can be made according to the actual printing condition of the user.
In theory, the color proofing device has a color gamut larger than the printing color gamut, and can be controlled by software to convert the color space between the output devices, so that the digital proofing effect simulates the color effect of the printing output device, that is, the color management process of the digital printer. Digital proofs replace traditional proofs.
At present, the digital proofing system consists of two parts: digital proofing output device and digital proofing control software. Among them, the digital proof output device refers to any color printer that can output digitally, such as a color inkjet printer, a laser printer, and the like. However, the printing speed, format, screening method and product quality that can meet the requirements of publishing and printing are mostly large-format color inkjet printers; digital proofing software is like EFI digital proofing software system, screen digital proofing system, Founder digital proofing system, etc. Wait. [next]
Second, color management
Color management is a scientific and digital method that corrects various devices and records the color characteristics of the device in a “characteristic file†to obtain predictable colors on the device and reproduce colors in different output environments. under. This is achieved by establishing an objective set of rules for color communication between devices to ensure consistency in color delivery throughout the printing system.
It is precisely because the color management system provides the possibility of consistent color in the case of using different raw materials between different devices, digital proofing can replace the traditional mechanical proofing and become a new proofing method. Therefore, digital proofing is a specific application of the core technology of color management. It is based on color management and cannot be separated from color management technology.
There are three parts to the work involved in color management: device calibration, device characterization, and color conversion.
1 device calibration. It refers to the standardization of the color characteristics of the device, which produces a predictable color from a specific color input value. In order to compensate for changes in equipment aging or other factors, the equipment must be calibrated periodically.
2 device characterization. Each device should have its corresponding color characteristics. The color characteristics of the device can be recorded by a combination of software and hardware to generate a "feature file". Device characterization is the creation of a "feature file (ICCProfile)" that describes the color characteristics of a device.
3 color conversion. When the same image is output on different output devices, different effects are produced because the gamut sizes of different devices are different. When we want to set the color of the A device and go to the B device to output, we need to use the “feature file†of the A device to perform color conversion and matching through the color management software to find the best color performance.
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