Prepress processing is an extremely important process in printing. Prepress equipment refers to the equipment that supports the process before printing on the machine, that is, the equipment applied to the prepress skills (computer graphic design, desktop publishing, etc.), including the computer plane. Design, desktop publishing, etc., is the general term for the processing process before printing. Prepress is to point out the whole process involved in the book from the initial idea to the printing. Prepress is composed of original graphic input, layout modification, imposition and plate making.

The electronic color separation machine is a device designed according to the principle of electronic color separation, using photoelectric scanning and electronic computing skills instead of cameras for picture plate making. Now, this machine is now completely replaced by two new skills: the first is laser photo-sequencing skills; the second is CTP direct-platemaking skills.

The plane scanner is mainly composed of four parts: optical system, photoelectric conversion system (charge coupled device CCD), electronic system and mechanical system. Strengths: The scanning speed is fast and convenient to use; the adaptability to the original is strong and the price is low. The defect is: the dynamic scale of the density is low; the darkness of the picture can be poorly reflected; the scanning transmission of the original is not enough; the resolution and definition are not as good as the roller scanner.

The drum scanner is developed by an electronic color separation machine. Its core skills are photomultiplier tube PMT and analog/digital (A/D) converter, including scanning cylinder, scanning light source and scanning head system. Its strength is: the use of photomultiplier tube (PMT) as an optical signal receiver, its sensitivity to light is high, so the density echoes a large scale, and the dark level of the picture is reflected and the resolution is high. The defect is that it is not as convenient to use as a flat scanner, the scanning speed is slower, and the price is higher.

A laser imagesetter is a device that outputs high-precision, high-resolution drawings and text on film or photo paper. It scans the layout text, drawings and graphic content produced by the prepress system on the photographic film accurately, then smears the film, and prints it on the printing press in large quantities. Phototypers are generally divided into three types: winch type, outer drum type and inner drum type (also the most expensive). Now, although they are widely used, they will be replaced by CTP direct plate making skills.

The trend of prepress equipment is to use high-tech skills to improve the equipment that adapts to the digital process. With the rapid development of network skills, electronic color separation machines, laser imagesetters, and printers that are still widely used will also become the former. history.

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