In recent years, there have been more and more domestic output centers. Due to the great difference between the advantages and disadvantages of the output devices, the quality of the output practitioners is uneven, resulting in a large difference in output quality. However, some output personnel do not make serious checks before and after the output. Therefore, when the film is delivered to the customer, there may be one or the other errors. Once the user ignores the inspection of the film, it will cause a big problem. Economic losses. For the inspection of the output film, it can be divided into the following aspects:
1. Check the text
This is a lot of work, especially in the case of a lot of layout text. But this work must be done. In the DTP design, production, and output process, due to various reasons (including software, equipment, personnel factors), it will cause problems such as typo, misplacement, lost words, lost strokes, font changes, garbled characters, and color changes in the output. These need to be carefully examined, especially the loss of strokes, which is easy to ignore. Therefore, when checking text, it is often necessary to check word by word. Some people think that as long as they have black and white proofs, and there is no problem with black and white, it is not. Since black and white samples and outputs may use different PS files and RIPs, there may be deviations between the two, and this deviation may cause the occurrence of scrap, which cannot be sloppy.
2. Check the film for scratches.
There are two types of scratches: black and white. The black line is caused by damage to the film surface of the film before fixing. Some black lines are very thin and need to be carefully checked to find out, but once printed, it will be more obvious, so when checking, you can put a blank sheet of paper under the film, which is easier to find. The white line is caused by dicing in the fixing and subsequent processes, or scratching the base of the sheet before. If the scratched base surface is generally not a problem, it can be printed on the printing plate; if the film surface is scratched and the graphic part is damaged, it needs to be re-exported.
3. After the film is output, you need to measure the core size with a ruler.
The error in the size of the core may be due to an error in the production, the scaling of the output print, and the error of the photo-alignment device. Generally, after the production is completed, before the output, the production output personnel should check the page according to the customer's request and correct the error in the production. One aspect of the inspection should include whether the core size is consistent with the user's requirements, so as to avoid incorrect size of the core due to manufacturing errors. Some files can be placed on a single sheet of paper in order to make a black and white proof, so "Full Print" is selected when printing. This option is used for the output to scale the core size. In the above two cases, the output personnel are careful to avoid the wrong size of the core, and the device error cannot be checked before the output. After the output is required, the film is carefully measured.
4. Check the size and position of the text, image
In some typesetting software, some functions are used, or the image is scaled in the typesetting software, and the image is not well placed in some typesetting software, which will cause changes in text, image size, position, and these are If it is not displayed on the screen, check the film after output to find it.
5. Check the color
The check for color is mainly whether the color separation is correct. Some people set the color in the production, but the color of the four-color printing has chosen the spot color. Some people put the image in RGB mode, and these output films will be reflected on the film. Also, in some typesetting software, when the color is set, the wrong option is selected, which will cause color color separation error. On the color plate which should not have color, the dot will appear, and the color will appear a certain deviation when printing. Inconsistent with the design ideas and user intentions, resulting in losses.
6. Check the layout information
Each piece needs to have information such as: crosshairs, corner lines, color scales, ladders, etc. There are some special pages that need to have fold lines to facilitate the work of the post-process. Crosshairs and corners are used for registering and cutting finished products. Color scales and scales are used to check the density, color and tone of the field. These are necessary for the work and quality inspection of the post-process. province.
7. Check overprint
Some people may say that the accuracy of the output device is now high, the overprint is accurate, and there is no need to check it. This statement is wrong. There are certain errors in the equipment, and the error of each type of equipment is different. Some devices have a certain error in overprinting when outputting large-format pages. Sometimes such errors may have more lines, which makes it difficult for the back-end printing. When some devices are patching, the overprinting error will be large. You need to re-output the four-color film, not just one color. Therefore, it is necessary to check whether the film overprinting is accurate.
8. Check trapping
This mainly checks for the presence of white spots in some places where the colors meet. In prints, if white edges appear between colors and colors, it will be difficult to see (except for the deliberate design), so this place needs to be trapped. (For details, see the article "Trapping Functions and Applications in Common DTP Software". 》). In the black place, you need to check that other versions can't be hollowed out. Other colors need to check that the hollowed out version is to be hollowed out.
These checks are indispensable after the output. The output practitioners should carefully check that the user should not be too light after taking the film, and should be carefully checked to avoid future disputes and unnecessary losses.
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