Discussion on Electron Separation and Screening Technology (2)

Second, the operation of the electronic color separation machine

The operation procedure of the electronic color separation machine is as follows:

Calibrate → Detect Original Density → Measure Magnification → Install Originals → Calibrate → Define Start Line → Load Sensitive Film → Scan → Develop

The role of the calibration is to determine if the electronic color separation machine is compatible with the automatic film processor. For example, a scanning electronic continuous adjustment ruler should have a density of 0.1 to 1.8. If it does not meet the requirements, it is necessary to adjust the voltage or development time.

Magnification of the original document is generally measured by a magnification measuring instrument, and the measured data is set in an electronic color separation machine.

The original must be cleaned before it can be attached to the scanner roller.

Calibration refers to the determination of the voltage range to accommodate various originals of different density contrasts.

The starting line is determined according to the size requirements of the printing requirements, and the finished cutting line is determined.

When the light sheet is loaded into the cassette and it is to be operated under a safe light, the photosensitive sheet should be slightly larger than the specified size.

The scanning process of the electronic color separation machine is as follows: When the scanning drum rotates, the optical system of the scanning head scans every pixel, and then it is converted into an electrical signal by photoelectric transfer, and a color computer is used to perform color correction and level correction on the scanning pixel. A series of processes such as subtle level emphasis and background color removal are performed. Then, the scale of the original is resized using a proportional computer. Finally, the electric signal is converted into a corrected light image signal corresponding to the original scanning pixel, and is recorded by the recording head. Exposure on film. The electronic color separation machine uses laser electrons to increase the wind, and uses the laser as the recording light source. The dot generator directly forms dots of a certain shape, size, and angle on the photographic film.

After the scan is completed, the photographic film is subjected to a developing and rinsing treatment to obtain a color-divided screened negative or positive negative film. Once scanned, yellow, magenta, cyan, and black four-color screening screens are usually available.

Third, the electronic whole page imposition system

The electronic full-page imposition system is a digital image processing device controlled by an electronic computer, which expands on the basis of an electronic color separation machine and can compose image and text information into a full-page layout according to a pre-designed layout. Because it is controlled by a computer, a series of complicated processes such as color separation, color correction, and imposition in a color image manuscript is simply completed, and the production efficiency is high.

Whole-page imposition systems generally consist of an input section, an imposition processing section, and an output section.

(a) input section

It consists of a scanning device and an input control device. The scanning device is an electronic color separation machine that matches the imposition processing system. The scanner scans, separates colors, corrects colors, converts colors, converts magnification, etc. of color image originals, and then digitizes the processed image signals, outputs the control device, and stores them on a magnetic disk.

The scanning conditions of the scanning device are displayed on the color display.

(II) Imposition processing section

It consists of a disk drive, an imposition display, an ultra-difference display, a color monitor, a graphic digitizer, and a dedicated electronic computer.

The data input from the input section is transferred from the disk memory to the image display screen. Then, with the help of a graphic digitizer, each image is transferred to the corresponding position specified in the layout design, and the complete layout is made and the necessary corrections are made. Stored in storage for ready access.

The imposition processing part, in addition to the function of electronic imposition, also has the functions of graphic production, image deformation, iron correction, layout, and the like. Can also be yellow, magenta, cyan, black data into red, green, blue data, can be used for monochromatic, two-color, three-color overlay display and revision.

(III) Output Section

The output control and recording device of the electronic color separation machine.

The output control device outputs the imposition data to the recording device of the electronic color separation machine. The recording device exposes the received imposition data to the photosensitive film through a dot generator to obtain the desired full-text whole-sheet imposition separation color film. Copy or plate use.

The advanced electronic full-page imposition system consists of:

The input scanning unit and the output scanning unit may use an electronic color separation machine or a dedicated device. The color separation slice data may be used to predict the printing effect through a pre-proofing device.

Author/Feng Ruiqian