Prepress output

At present, there are many ways to export images, such as Computer to Proof, Computer to Film, Computer to Plate, and Computer to Press. To Paper / print (digital printing) and so on.

The usual proofing is after the printing page is completed, the proofing is divided into digital proofing and analog proofing. Analog proofing is also called mechanical proofing. Its essence is analog printing. It is based on the printing conditions (such as paper, ink, printing, etc.). The printing plate is installed on the proofing machine to print and get proofs. The workflow is generally: graphic output technology (get the original version) → drying plate → analog proofing → signing → printing plate production.

The purpose of proofing is as follows: 1 Checking the pre-press work, mainly to check the quality of the original. For example, whether the original tone and color reproducibility meet the requirements; whether the layout size, image, text layout, and rule line are correct, and whether there are any omissions, etc., if there is something wrong, it is necessary to make corrections. 2 printed reference samples, mainly for the formal printing to provide proofs or basic parameters of printing, such as ink color, dot reproduction range, etc., to achieve standardized, standardized operation of printing. 3 As a customer's signature, the printed sheet is mainly provided to the customer. If the customer approves, it will be printed on the printed sheet. Otherwise, the printing company has to be revised.

Due to its complicated process, high cost, long production cycle and large influence by human factors, a series of defects are gradually withdrawing from the historical stage. More and more printing companies use digital proofing technology. The so-called digital proofing is to print the page (or printed sheet) data of the color desktop system directly through the color printer (inkjet, laser or other means) without any form of simulation means to check the image page of the prepress process. Quality, provide reference proofs for the printing process, and provide users with the basis for signature printing.

The usual digital proofing system mainly consists of two parts: a color management system and an output device. Digital proofing systems use a wide variety of output devices, including thermal transfer output devices, thermal sublimation output devices, inkjet output devices, and laser output devices. Two core technologies, PostScript interpretation technology and color management technology are included in the color management system. The PostScript interpreter ensures that the user's files are correctly interpreted. The color management technology ensures that the proof output is consistent with the color of the printed output. There are many common color management software, such as the Bestcolor digital from Germany Best (acquired by EFI). Proofing software, Australia's BlackMagic digital proofing software, Malaysia's Star proof digital proofing software and German GMG's digital proofing software.

The prepress process for companies using digital printing is as follows:

Digitization process of originals → graphic processing technology → digital proofing technology → proofing → graphic output technology (output film or direct output printing plate)

How should I choose my own digital proofing system? Generally speaking, when considering the digital proofing system, two main aspects are considered: first, the technical specifications of the digital proofing system itself in terms of color reproduction and print quality; second, the effect of matching printing and the adaptability to printing production. As far as the products we have listed above, different softwares have their own characteristics. For example, Best Color digital proofing system is the most widely used digital proofing system in China, which can make the general inkjet printer also have better output quality. The performance of digital proofs. However, due to the defects of the ICC technology, if the output parameter setting is incorrect during the proof output, the output will not be output, and the reproduction of the gray balance is also insufficient. The Australian BlackMagic digital proofing software only controls the spot color of the spot color when processing the spot color. The effect of the selective color correction function is not ideal, and the control of the level curve is not very accurate. Malaysia's Star proof digital proofing software corrects the color by adjusting the density. The color difference ΔE between the color and the printed color adjusted by Star Proof software is about 1.8. The processing of the 1-BIT TIFF file is powerful and can output images with a precision of 200 lpi. However, it requires a high level of operator and requires a good understanding of color. German GMG's digital proofing products are excellent in single black, spot color and true dot proofing. Therefore, when purchasing digital proofing products, users should consider the specific needs of the enterprise and refer to the characteristics of each software for comprehensive consideration.

In addition to purchasing digital proofing software, you must choose a digital output device when purchasing a digital proofing system. Color laser printing and thermal transfer/sublimation printing in digital output devices have not been widely adopted due to high equipment and printing costs. Color laser printout accuracy does not reach the accuracy of printed matter, so it is rarely used in digital proofing. At present, color inkjet printing is the main product for digital proofing. Currently, there are two types of inkjet printing. Foamed inkjet printing technology and micro-piezoelectric technology. The thermal foaming inkjet printer emits ink by instantaneously heating the thermistor to expand the ink droplets in the firing chamber to blast. The color stability of the ink is relatively poor due to changes in the chemical composition of the ink at high temperatures. In addition, this type of printer nozzle is a consumable part, so the print quality has a process of changing from good to bad. It is very difficult to maintain the color stability of the device using this technology. Micro Piezo Technology Inkjet printing uses voltage changes to inject ink from a nozzle. Its nozzle is a solid piece that fundamentally ensures color stability and consistency, meeting the requirements of digital proofing for output devices. At the same time, the cost of the output is also greatly reduced. Micro-piezoelectric technology is a patented product of Epson. The intelligent ink drop conversion technology can make the minimum droplet output of the product reach 4ppl, thus meeting the requirements of fine dots of printed matter, and the image and text are more clear.

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