Fourth, the film 1, the film linear color separation film is based on the percentage of outlets to reflect the level of the image and color changes. If the linearity of the film is not good, the printing effect of the image will be directly affected, which may result in text distortion, color cast of the shading of the picture, poor level reproduction, and the like. In order to eliminate the above problem, it can be solved by adjusting the film output linearity. The specific operation is as follows.
(1) Make a 0-100% 21 Gradient Scale in Photoshop.
(2) After determining the resolution of the imagesetter, output the scale.
(3) Comprehensively adjust the exposure intensity of the photosetter, the temperature and time of the film press, etc., and rinse the film on the scale.
(4) Measure and record the percentage of 0-100% of all levels of outlets.
(5) Compare the measured value with the standard value of the grading scale to determine the gradation transformation curve in RIP. If the standard is 50%, the measured value is 53%, indicating that the network point has been expanded by 3%, and 50% of the RIP needs to be changed to 47%.
(6) Repeat the above operation to control the error value of each network point within 2%.
(7) Flatten the curve and save the linear calibration parameters.
2. Comparison of Domestic Films and Imported Films Compared with imported films, the highest density, fog, hardness and contrast of domestic films are all relatively good. The main problem is that the linearity is not good.
After the use of domestic film, there will be a large error in the value of the output network. The direct consequence of this is that the picture is of the same grade, the color is inaccurate, the text is thick and thick, and the original reproduction is seriously affected. Therefore, the use of domestic film should first adjust its linear parameters.
3. Network Point Control When film output, the choice of network point parameters (including dot shape, number of screen lines, and screen angle) is also important. In the printing process, circular dots are generally used, and the angle of the CMYK cable is set to 15°, 45°, 90°, and 75°, respectively. As for the determination of the number of screen lines, it is necessary to take into consideration factors such as manuscripts, paper, and ink. The larger the number of lines, the better the printing effect of the image, but it cannot be too large, otherwise it will result in the image hierarchy and even the phenomenon of stencil. The general newsprint printing uses 85-100 lines/inch, the offset paper uses 100-150 lines/inch, and the coated paper uses 150-200 lines/inch. The screening angle can use the default value while checking whether the grayscale conversion curve called is correct.
To reduce the occurrence of moiré or rose spots, one must increase the number of screen lines, and second, avoid the use of elliptical dots with high eccentricity to use symmetrical dots such as circles and squares. In theory, the FM network will not produce moire.
4. Repeatability of Film Positioning Accuracy of film repeatability directly affects the efficiency of platemaking, photocopying, and print quality. The alignment accuracy of the imagesetter for outputting color separation films cannot be ignored. Four-color film is required to repeat the positioning error <0.1mm, to ensure four-color film registration, no ghosting, multiple eyelids and other phenomena. Experiments show that by adopting some technological means, it can completely meet the requirements of repeated positioning accuracy (control the error within 10μm).
In order to meet the requirements of film repetitive positioning accuracy, the following points should be noted when outputting the film.
(1) After a roll of new film is finished, it should be used to output a color version of the film after at least five sheets of non-colored film have been output.
(2) A set of 4 films is output continuously as much as possible at once.
(3) Use a relatively loose collection box. The importation of the collection box, reels, etc. should be particularly relaxed so as not to block the film.
(4) According to the different conditions of the retracting box, 2-4 sets of four-color film can be continuously output, generally no more than 4 sets, it is recommended to continuously output 2 sets.
5. The quality of the film flushed film has a lot to do with its washing process. The first high-quality film is to have a sufficiently high density of dots: Second, the dots should be clear and not imaginary; third, the film should be bright and the fog should be less than 0.04.
In order to ensure the quality of film processing, attention should be paid to the following points: First, it is necessary to have a good grasp of the developer and fixer concentration; secondly, the time and temperature for developing and fixing should be set correctly; thirdly, the developer must be replaced promptly. Fixer; Fourth, the liquid should be evenly mixed, not because of the liquid did not stir well and the film density uneven.
The washed out film is mainly prone to problems such as white spots and scratches. The white spots are caused by insufficient fixing. Generally, the concentration of the fixing solution is not enough, and the amount of medicine is not enough. So long as the film is re-inserted from the fixing inlet of the washing machine, after washing and drying, the white spots on the film will disappear. . The appearance of scratches may be due to the deformation of the machine hardware in the direction of the processor. This requires that we periodically clean the film processor with a cleaning agent, and the roller must be scrubbed with a damp cloth to avoid the formation of crystals.
In the film flushing process, it is necessary to carefully check at any time and find that abnormalities are dealt with promptly. Because the film output is slow, in order to prevent the waste film from appearing, it is better to check the filming machine before flushing the film. If there is any problem, it should be adjusted in time.
As the final process, film inspection should really play a role in mending leakage and should pay enough attention to it. After the correct film is cut, it can be made into a print, then printed and printed.
In summary, as long as we reasonably grasp and make good use of design and production, RIP, laser photocopying and disposing machinery, and film during the printing process, we can obtain an ideal film output effect and improve the quality and efficiency of the output film. In this way, we can guarantee the high quality of printed products, so that enterprises can be invincible in the market competition.
(1) Make a 0-100% 21 Gradient Scale in Photoshop.
(2) After determining the resolution of the imagesetter, output the scale.
(3) Comprehensively adjust the exposure intensity of the photosetter, the temperature and time of the film press, etc., and rinse the film on the scale.
(4) Measure and record the percentage of 0-100% of all levels of outlets.
(5) Compare the measured value with the standard value of the grading scale to determine the gradation transformation curve in RIP. If the standard is 50%, the measured value is 53%, indicating that the network point has been expanded by 3%, and 50% of the RIP needs to be changed to 47%.
(6) Repeat the above operation to control the error value of each network point within 2%.
(7) Flatten the curve and save the linear calibration parameters.
2. Comparison of Domestic Films and Imported Films Compared with imported films, the highest density, fog, hardness and contrast of domestic films are all relatively good. The main problem is that the linearity is not good.
After the use of domestic film, there will be a large error in the value of the output network. The direct consequence of this is that the picture is of the same grade, the color is inaccurate, the text is thick and thick, and the original reproduction is seriously affected. Therefore, the use of domestic film should first adjust its linear parameters.
3. Network Point Control When film output, the choice of network point parameters (including dot shape, number of screen lines, and screen angle) is also important. In the printing process, circular dots are generally used, and the angle of the CMYK cable is set to 15°, 45°, 90°, and 75°, respectively. As for the determination of the number of screen lines, it is necessary to take into consideration factors such as manuscripts, paper, and ink. The larger the number of lines, the better the printing effect of the image, but it cannot be too large, otherwise it will result in the image hierarchy and even the phenomenon of stencil. The general newsprint printing uses 85-100 lines/inch, the offset paper uses 100-150 lines/inch, and the coated paper uses 150-200 lines/inch. The screening angle can use the default value while checking whether the grayscale conversion curve called is correct.
To reduce the occurrence of moiré or rose spots, one must increase the number of screen lines, and second, avoid the use of elliptical dots with high eccentricity to use symmetrical dots such as circles and squares. In theory, the FM network will not produce moire.
4. Repeatability of Film Positioning Accuracy of film repeatability directly affects the efficiency of platemaking, photocopying, and print quality. The alignment accuracy of the imagesetter for outputting color separation films cannot be ignored. Four-color film is required to repeat the positioning error <0.1mm, to ensure four-color film registration, no ghosting, multiple eyelids and other phenomena. Experiments show that by adopting some technological means, it can completely meet the requirements of repeated positioning accuracy (control the error within 10μm).
In order to meet the requirements of film repetitive positioning accuracy, the following points should be noted when outputting the film.
(1) After a roll of new film is finished, it should be used to output a color version of the film after at least five sheets of non-colored film have been output.
(2) A set of 4 films is output continuously as much as possible at once.
(3) Use a relatively loose collection box. The importation of the collection box, reels, etc. should be particularly relaxed so as not to block the film.
(4) According to the different conditions of the retracting box, 2-4 sets of four-color film can be continuously output, generally no more than 4 sets, it is recommended to continuously output 2 sets.
5. The quality of the film flushed film has a lot to do with its washing process. The first high-quality film is to have a sufficiently high density of dots: Second, the dots should be clear and not imaginary; third, the film should be bright and the fog should be less than 0.04.
In order to ensure the quality of film processing, attention should be paid to the following points: First, it is necessary to have a good grasp of the developer and fixer concentration; secondly, the time and temperature for developing and fixing should be set correctly; thirdly, the developer must be replaced promptly. Fixer; Fourth, the liquid should be evenly mixed, not because of the liquid did not stir well and the film density uneven.
The washed out film is mainly prone to problems such as white spots and scratches. The white spots are caused by insufficient fixing. Generally, the concentration of the fixing solution is not enough, and the amount of medicine is not enough. So long as the film is re-inserted from the fixing inlet of the washing machine, after washing and drying, the white spots on the film will disappear. . The appearance of scratches may be due to the deformation of the machine hardware in the direction of the processor. This requires that we periodically clean the film processor with a cleaning agent, and the roller must be scrubbed with a damp cloth to avoid the formation of crystals.
In the film flushing process, it is necessary to carefully check at any time and find that abnormalities are dealt with promptly. Because the film output is slow, in order to prevent the waste film from appearing, it is better to check the filming machine before flushing the film. If there is any problem, it should be adjusted in time.
As the final process, film inspection should really play a role in mending leakage and should pay enough attention to it. After the correct film is cut, it can be made into a print, then printed and printed.
In summary, as long as we reasonably grasp and make good use of design and production, RIP, laser photocopying and disposing machinery, and film during the printing process, we can obtain an ideal film output effect and improve the quality and efficiency of the output film. In this way, we can guarantee the high quality of printed products, so that enterprises can be invincible in the market competition.
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