High-quality films, high-precision photo-setters and good washing conditions are favorable guarantees for film output quality. However, under the current working conditions, how to ensure and improve the output quality of films? I think we should start with the following aspects:
First, the film linearization
The first thing that needs to be highlighted is the linearization of the film. Because after we scan, make the image, and finally on the color separation film, we use the percentage of dots to reflect the level and color of the image. If the linearity of the film is not good, it will directly affect the printing effect of the image. There are text distortions, shaded images, and poorly reproduced layers. The linearization of the film is:
1. Make a 21-level gradient shave from 0%-100% in Photoshop.
2. After determining the resolution of the imagesetter, output the scale.
3. Comprehensively adjust the exposure intensity of the imagesetter, the temperature, time and other parameters of the film processor.
4. Measure the percentage of dots from 0% to 100% of each level with a density meter and record them.
5. The measured value is compared with the standard value of the step scale and the gradation transformation curve in the RIP is adjusted. If the standard is 50%, the measured value is 53%, indicating that the network point is expanded by 3%, and the input needs to be 47% at 50% of the RIP.
6. Repeat the above operation to control the error of each network point within 2%.
7. Smooth the curve and save the linear correction parameters.
Second, the exposure of the phototypesetter and washing conditions
In the linear calibration of the film, the exposure intensity of the image-setter and the display and fixing parameters of the film machine also need to be adjusted repeatedly, so as to prevent the film bottom ash from being too large, the density is insufficient, the layout is not uniform, the actual field is not true, the level is lost. , absolutely net, paste version and other phenomena. First of all, to ensure that the density of 100% at ≥ 3.0, the film bottom ash ≤ 0.04, with a magnifying glass to observe dense, clear edges, 50% of the four corners of the square dot just overlap each other. Should also be 2% -3% of the outlets, and should ensure that 2% -3% of the outlets are not lost.
Third, the control of outlets
In the film output, the choice of the dot parameters (including the shape of the dot, the number of dots of the dot, and the angle of the dot) is also very important. In the printing of newspapers, we generally use circular dots, and the angle of CMYK is 15°, 45°, 75°, and 90°. As for the selection of the number of meshes, it is necessary to consider the original document, printed paper, and ink in consideration. The larger the number of meshes, the better the effect of image printing, but the number of meshes cannot be too large. As a result of the expansion of outlets, they have become one and the same, resulting in image hierarchy and even paste-up and other phenomena. In general newsprint printing, the number of screens is 100, and offset and coated papers are higher.
When moiré or rose spots appear, reduce the appearance of moiré or rose spots. First, increase the frequency of the screen (that is, increase the number of meshes). Second, avoid the use of symmetrical dots such as circles and squares, and use larger eccentricity. Oval outlets. In theory, the FM network will not produce moire.
Fourth, the film positioning accuracy
For the four colored films, the alignment accuracy of the imagesetter is also not negligible. It requires the repeat alignment error of four films to be less than or equal to 0.1mm, to ensure the four-color film registration, no ghosting, multiple eyelids and so on.
Fifth, the film's flush
The rinsing of the film is the last process of photocopying work. The quality of the film has a lot to do with the rinsing process of the film. The quality of the film, first, to ensure that the network density is high, and second, the network to be clean, can not send virtual, and third, the film should be translucent, the fog is less than 0.04.
To ensure the quality of film rinsing, we must first master the concentration of the developer and fixer, and correctly set the developing and fixing time and temperature; it is also very important to replace the developer and fixer in time; Stir evenly, do not cause the film to be uneven due to poor mixing of the liquid.
The problems that arise from the film that is washed out are mainly the white spots and scratches on the film. White spots are caused by insufficient fixing. Generally, the concentration of the fixing solution is not enough, and the amount of syrup is insufficient. So long as the film is re-plugged from the fixing inlet of the washing machine, and then washed and dried, the white spots on the film will be disappear. One of the reasons for the appearance of scratches is the deformation of the machine hardware in the direction of the processor and the scratching of the film. There is also a reason that the liquid crystal is crystallized on the rolling roller. The hard crystal also scratches the film. It requires us to use a cleaning agent to periodically clean the punching machine. In particular, the rolling roller should be scrubbed with a damp cloth to avoid the formation of crystals.
First, the film linearization
The first thing that needs to be highlighted is the linearization of the film. Because after we scan, make the image, and finally on the color separation film, we use the percentage of dots to reflect the level and color of the image. If the linearity of the film is not good, it will directly affect the printing effect of the image. There are text distortions, shaded images, and poorly reproduced layers. The linearization of the film is:
1. Make a 21-level gradient shave from 0%-100% in Photoshop.
2. After determining the resolution of the imagesetter, output the scale.
3. Comprehensively adjust the exposure intensity of the imagesetter, the temperature, time and other parameters of the film processor.
4. Measure the percentage of dots from 0% to 100% of each level with a density meter and record them.
5. The measured value is compared with the standard value of the step scale and the gradation transformation curve in the RIP is adjusted. If the standard is 50%, the measured value is 53%, indicating that the network point is expanded by 3%, and the input needs to be 47% at 50% of the RIP.
6. Repeat the above operation to control the error of each network point within 2%.
7. Smooth the curve and save the linear correction parameters.
Second, the exposure of the phototypesetter and washing conditions
In the linear calibration of the film, the exposure intensity of the image-setter and the display and fixing parameters of the film machine also need to be adjusted repeatedly, so as to prevent the film bottom ash from being too large, the density is insufficient, the layout is not uniform, the actual field is not true, the level is lost. , absolutely net, paste version and other phenomena. First of all, to ensure that the density of 100% at ≥ 3.0, the film bottom ash ≤ 0.04, with a magnifying glass to observe dense, clear edges, 50% of the four corners of the square dot just overlap each other. Should also be 2% -3% of the outlets, and should ensure that 2% -3% of the outlets are not lost.
Third, the control of outlets
In the film output, the choice of the dot parameters (including the shape of the dot, the number of dots of the dot, and the angle of the dot) is also very important. In the printing of newspapers, we generally use circular dots, and the angle of CMYK is 15°, 45°, 75°, and 90°. As for the selection of the number of meshes, it is necessary to consider the original document, printed paper, and ink in consideration. The larger the number of meshes, the better the effect of image printing, but the number of meshes cannot be too large. As a result of the expansion of outlets, they have become one and the same, resulting in image hierarchy and even paste-up and other phenomena. In general newsprint printing, the number of screens is 100, and offset and coated papers are higher.
When moiré or rose spots appear, reduce the appearance of moiré or rose spots. First, increase the frequency of the screen (that is, increase the number of meshes). Second, avoid the use of symmetrical dots such as circles and squares, and use larger eccentricity. Oval outlets. In theory, the FM network will not produce moire.
Fourth, the film positioning accuracy
For the four colored films, the alignment accuracy of the imagesetter is also not negligible. It requires the repeat alignment error of four films to be less than or equal to 0.1mm, to ensure the four-color film registration, no ghosting, multiple eyelids and so on.
Fifth, the film's flush
The rinsing of the film is the last process of photocopying work. The quality of the film has a lot to do with the rinsing process of the film. The quality of the film, first, to ensure that the network density is high, and second, the network to be clean, can not send virtual, and third, the film should be translucent, the fog is less than 0.04.
To ensure the quality of film rinsing, we must first master the concentration of the developer and fixer, and correctly set the developing and fixing time and temperature; it is also very important to replace the developer and fixer in time; Stir evenly, do not cause the film to be uneven due to poor mixing of the liquid.
The problems that arise from the film that is washed out are mainly the white spots and scratches on the film. White spots are caused by insufficient fixing. Generally, the concentration of the fixing solution is not enough, and the amount of syrup is insufficient. So long as the film is re-plugged from the fixing inlet of the washing machine, and then washed and dried, the white spots on the film will be disappear. One of the reasons for the appearance of scratches is the deformation of the machine hardware in the direction of the processor and the scratching of the film. There is also a reason that the liquid crystal is crystallized on the rolling roller. The hard crystal also scratches the film. It requires us to use a cleaning agent to periodically clean the punching machine. In particular, the rolling roller should be scrubbed with a damp cloth to avoid the formation of crystals.
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