The hottest electronic color separator and roller

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Electronic color separation machine and roller type input scanner (6)

the basic model of the desktop system is the same as that of the electronic color separation machine. That is, the screenmatrix that constitutes the points is the same. The dot matrix determines three basic elements: point shape, point angle and point percentage. Therefore, it is also called dot mode dsp

(dotscreenpattern). The number of dots plus lines is the width, which is realized by the automatic zoom optical system in the control unit of the recording system. In other words, the higher the number of lines added, the smaller the recording spot

c. Dot mold is the core technology of electronic addition in the process of color separation between desktop system and electronic color separation machine. It adopts the principle of supercelltechnology to form a digital system that can determine the shape, angle and percentage of points, which is called super point mode. Super touch makes each point of the yellow, magenta, cyan and black color separations in the halftone image complete through its own repetition

super dot mode is a digital control architecture as shown in the figure. Each super dot mode consists of nine four grid modules or 36 grids. Each gate mode is composed of 36 exposure points (recording elements) and is realized by six laser scanning and twice scanning

for different angles, the number of points in each super dot module is slightly different. As shown in the figure

example: 1 in the 0 ° angle state, each super dot module can be decomposed into 9 points. 2 in the 45 ° state, each super dot module can be decomposed into 8 points. 3 in the ± 18.4 ° angle state, each super dot module can be decomposed into 10 points

in the above adding angle, it can be found that 18.40 ° is used to replace 15 ° and 75 ° in the conventional adding. The reason is that the digital point technology requires that each vertex of the point element must coincide with the recording grid, so that the same point shape can be duplicated on the recording grid. That is, the amount of calculation necessary to generate halftone points is significantly reduced, which is the so-called rational tangent theory. As shown in the figure, the angle adopts α= ± 18.4 ° 0 just makes the numerator and denominator values in tg=1/3 rational numbers, meeting the consistency between the point element and the recording grid determined by the output equipment's ability to scan the laser beam at fixed points, so that the point angle and shape can be controlled

because the same grid has the same number of exposure points. That is, the exposure points of the same super dot mode are the same. However, if the number of dots in the same super dot mode is different at different angles, the exposure of each dot at different angles is different. Because the same grid has the same number of exposure points. That is, the exposure points of the same super dot mode are the same. However, if the number of dots in the same super dot mode is different at different angles, the exposure of each dot at different angles is different. As shown in the figure

example: 1 when the angle is 0 °, a point is the same as a four grid, so the point is composed of 12 × 12=144 exposure points. Then a super dot module consists of 9 × 144=1296 exposure points

2 when the angle is 45 °, since there are 8 points in a super dot mode, the number of exposure points at each point is 1296/8=162

3 when the angle is ± 18.4 °, because there are 10 points in the mode at one super point, the number of exposures at each point is 1296/10=129.6, about 130

due to the difference in the number of points of different angles in the same super dot mode, the point frequencies corresponding to different angles are also different. According to the definition of point frequency: F0 °: F45 °: F ± 18.4 ° =9:8:10. If the 0 ° corner frequency is 175l/in, F45 ° =8/9 × 175≈165L/in,f±118.4°=10/9 × 175≈184L/in。

point percentage is completed by point function using a threshmatrix technology. This point function is a mathematical function. For any given point setting, it decomposes the 8bit (256 level) image gray value output by the image information processing unit into 0% according to the visual MTF characteristics and printing process requirements? 100% (level 101) point value and transmit to the point computer corresponding to 0%? The halftone image with 100% point value records the position and order of elements, so as to obtain the desired color separation point image

after the above process, the control data in each unit can be found from its position coordinates. It is used to determine the turning on and off of each control unit (modulator) of the multi beam recording beam, so as to form points of different sizes, shapes and properties as shown in the figure

IV. main technical parameters of the electronic color separator

(1) original index it indicates the ability of the electronic color separator to adapt to the original. Including: (a) the maximum size of the original; (b) Type of original; (c) Three basic elements, such as the original density range

(2) the index of color separations refers to the specifications of color separations that can be copied by the electric separator. Including: (a) the maximum size of the color separation chip; (b) Color separation type (negative/positive, positive/negative, continuous tone/halftone); (c) Arrangement of color separations (how many colors can be divided in one scan)

(3) the scanning speed reflects the working efficiency of the machine (on the premise of the same number of recording lines)

(4) record the number of lines (l/cm, l/in) scanned by the displacement of the recording head within the transverse feed length per unit

(5) image correction function refers to the ability of the electrical unit to perform and correct images. Including color correction, level correction, black version calculation, ucr/pcr, fine level emphasis, proportion transformation, composition, pre proofing, continuous scanning, etc

(6) zoom function refers to the magnification range, accuracy and deformation ability of the electronic unit to reduce or enlarge the original. Generally, the zoom ratio of the electric unit is 0.2? 20, accuracy of 1%? 0.1%。

(7) auxiliary function refers to the flat and gradual generation of electric extension, control parameter storage and compatibility with other systems

v. drum scanner

at present, the drum scanner is mainly used because it uses photomultiplier tube as the light receiving element, and the manufacturing technology of electric extension is relatively mature, with a maximum width of 25.6in and a resolution of 2000? Within 20000dpi. However, as the application of CCD technology tends to be improved, the performance of the platform scanner continues to improve, and there is a trend to completely replace the desktop roller scanning electronic tensile machine

here are some features of chromagraphs3400, a roller scanner produced by linotype-hell company. In fact, s3400 is the scanning head of C3000 series electric extension of some domestic universities and large enterprises that D purchases these friction and wear testing machines


1s3400 scanner scans the original document as an electronic document and stores it in the Mac computer. It not only has the high precision and high speed of the electric extension, but also combines it with the desktop electronic plate making system, so it has the flexibility and creative design function

2s3400 can scan transparency, reflection, positive and negative films. The scanning hole has 38 gears that can be adjusted from 12 μ M to 40 μ m;

3 is the original zoom ratio 10%? The microcomputer control system can automatically control the experimental force, displacement and deformation in various modes by 3000%, and the maximum scanning width is 65cm × 50cm, the maximum original has the characteristics of automatic calculation of maximum experimental force value, damage value, automatic return of experiment, etc., with a thickness of 2mm

4s3400 is controlled by the LinoColor software on the Mac computer. The scanning resolution reaches 19200dpi, ensuring that the perfect level and color quality can still be achieved at 2000% magnification

5 the density range, black-and-white field, aperture size and original type can be set by clicking the mouse

6 convert RGB, cmybk and CIELab color spaces

7 automatically analyze originals, correct color deviation, adjust highlight and dark tone levels--- Chinese printing market

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