Overprinting: when multi-color printing is required, overlapping registration is required for printing of various color plate patterns;
Trap: Refers to the intersection of one color block and another color block must be overlapped to avoid white edges when printing, so it is also called fill white; the place where the two colors meet may not be trapped There is a shift in printing, which causes white borders or color aliasing. Trap is to use the two colors of the intersection to penetrate each other a little at the intersection, and there will be no white borders.
Imprinting and overprinting have the same meaning, that is, one color block is overprinted on another color block. However, pay special attention to the overprinting of black text on the color image when printing. Do not hollow out the pattern under the black text, otherwise the black text will show white borders when the printing is not accurate.
For example: the four Ps are 16 degrees wide, made of PS, the text is K100, and the black characters sent to the center of the filming are not imprinted, that is, the positions of the black characters are hollow on other color versions, which will cause overprint The white text is overprinted. The black text overlay in PS is to change the layer mode of the black text layer to the positive overlay. In this way, the black text is not hollowed out in other color versions, so that there is no white. The situation. Friends who have just entered the printing industry and like to use PS design must pay attention to this problem. In addition, they must develop a good habit of making PS base maps, CD or AI typing. In this way, the printed text will not have burrs.
In general, the black in CD and PM are stamped by default.
1. Should all bitmaps be overprinted or trapped? Because some customers directly sent us bitmap (some bitmaps are quite complicated) files and output proofs, they did not find any phenomenon of inaccurate color registration.
Answer: Unused ~~~ Overprinting is only necessary for K100 black or graphics under certain circumstances.
2. How thick is the line overprinting in order to register the color and print? Is a trace (0.01 mm) enough? How much does it take to convert to pt units?
Answer: Very thin line ~~ 0.2 points. 1pt = 0.35146mm
3. Do overprinting in CD and ILL, their function and principle are the same? It seems that the thickness of the line overprint in ILL is half of the line, isn't it? What about in the CD?
Answer: No such statement.
4. Is overprinting in ILL safer than CD?
Answer: Follow the normal method. Software is just a tool, no better or safer
5. Are spot colors overprinted, spot colors and black, tertiary and black, are they overprinted with lines? Do spot colors and black, post-secondary, and black-on, use overfill to overprint? If you want to prevent the "two kinds of black" from causing abnormal patterns, can you only use lines to overprint? Or is there any other way? Or is it possible to register the color without overprinting? Do spot colors have transparency? Can't spot spot colors be overprinted with spot colors and can only be overprinted with lines?
A: Relatively speaking, the lines are overprinted better.
6. Assuming some kind of overprinting
Suppose in ILL, a pattern with a red fill in the middle, a green outline line, and a green fill pattern underneath. Can lines be overprinted (use green outline lines on the same layer as red, and green underlay for overprinting)?
Answer: No overprinting is required. Normal output is fine
7. If it is only CMYK, the pattern is similar to the color insert in "Cartoon King", or the cartoon comic in "Cat and Mouse", the animated characters have black lines ticked to indicate their outlines. Should we overprint such a complicated picture? It's hard to imagine a color block, overprinting a color block? ! If there is no overprinting, how are those cartoon magazines printed?
Answer: Again, under normal circumstances, only black is used for overprinting, and other colors are output normally.
8. If the black outline on the artwork that someone gave me is made by the method of "leaking black" (for example, a piece of red and green has a seam in it, and a piece of black is under the seam), is this artwork "You can only check it again and then make an overprint", is this too bleak
Answer: A piece of black can be overprinted under the seam.
In fact, overprinting is very simple, just remember one thing: under normal circumstances, only black characters or black graphics are overprinted, and other colors default to normal output ~
If it is a printing car with millions of units like Heidelberg, there is no overprint problem at all, but according to the national conditions of the country, many printing manufacturers do not have such good equipment, so there is a printing car that is not accurate and must be overprinted phenomenon.
When overprinting strokes, it is generally based on experience. A large area of ​​filling strokes should be set thicker, 0.1 ~ 0.2mm is suitable, and a small area of ​​filling strokes should be relatively thin. After the strokes are folded, the magnifying glass is used to observe the printed matter. Sometimes, the strokes become black, which is impossible.
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