What is overprinting, overprinting, trapping, stamping and precautions
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Overprinting: refers to the multi-color printing requires overlapping registration of each color pattern when printing;
Trap: refers to a certain interlacing overlap between a color block and another color block to avoid white edges when printing, so it is also called white; the two color intersections may be in the case of not trapping. There is an offset in the printing, resulting in white edges or color aliasing. The trapping is to penetrate each other with the two colors of the intersection at the place where the intersection is made, and no white edges will be produced.
Embossing and overprinting mean the fact that one color patch is overprinted on another color block. However, when printing, pay special attention to the overprinting of black text on the color image. Do not hollow out the pattern under the black text. Otherwise, the black text will be exposed when the printing overprint is not on time.
For example: the height of four P is 16 open, made with PS, the text is sent to K100, and sent to the film center to tell that the black word is not embossed, that is, the position of the black word is hollowed out on other color plates, which will cause overprinting. Not allowed to be white, the black text overprint in PS is to change the layer mode of the black text layer into a positive layer, so that the black text in other color versions is not hollow, so there will be no white The situation. Friends who have just entered the printing industry and like to use PS design must pay attention to this issue. Also, be sure to develop a good habit of PS to make base map, CD or AI typing. The printed text will not be burred.
Generally, black in CD and PM is the default imprint.
1. Do all bitmaps have to be overprinted or trapped? Because some customers directly give us bitmaps (some bitmaps are quite complicated) files, output proofs, and did not find any color misregistration.
A: Don't use ~~~ Overprint in certain situations as long as the black or graphic of K100 can
2. How thick is the line overprint to register the color, and print? Is a trace (0.01 mm) enough? How much does it take to convert to a pt unit?
A: Very thin line ~~ is also 0.2 points. 1pt=0.35146mm
3. Do overprinting in CD and ILL, are they working, are the principles the same? It seems that the thickness of the lines in ILL is half of the line, isn't it? What about the CD?
A: No such statement.
4. Do stacking in ILL, is it safer than CD?
A: Do it in the normal way. Software is just a tool, no good or safer
5. Spot color overprint, spot color and black, special, black, is it overprinted with lines? Spot color and black, special, black, is not filled with overprint? If you want to prevent the "two kinds of black" from causing the pattern to be abnormal, can you only use lines to overprint? Or is there any other way? Or do you want to register the color out of the film without overprinting? Is there a transparent attribute for spot colors? That spot color can't be overprinted with spot colors, can only be overprinted with lines?
A: Relatively speaking, the lines are overprinted.
6. Suppose some sort of overprint
Suppose that in ILL, a pattern with a red fill in the middle, a green outline line, and a green fill pattern underneath, can you do line overprinting (using green outline lines with the same layer as red, and green fill underneath)?
A: No overprinting is required. Normal output can be
7. If it's just CMYK, the pattern is similar to the color insert in "King of the King", or like the cartoon in "Cat and Mouse", the animated characters have black lines to indicate their outline. Do you have to do such a complicated picture? It's hard to imagine a color block, a color block for overprinting? ! If you don't overprint, how are those anime magazines printed?
A: Again, under normal circumstances, only black is overprinted, and other colors are output normally.
8. If the black outline on the artwork that someone else gave me is made by "black leaking" method (such as a piece of red and green with a seam and a piece of black underneath the seam), is this artwork correct? "You can only hook it yourself and make a stack of it again." Is this too bleak?
A: Below the seam is a black overprint.
In fact, overprinting is very simple. Just remember that you can do it: in general, only black characters or black graphics are overprinted. Other colors default to normal output~
If it is a printing truck of several million like Heidelberg, there is no overprint problem at all, but according to the national conditions of the country, many printer owners now do not have such good equipment, so there is a problem that the printing car is not allowed to be overprinted. phenomenon.
When overprinting strokes, it is generally based on experience. Large-area filled strokes should be set to be thicker, 0.1~0.2mm is appropriate, and small areas should be relatively thin. After the strokes are folded, using a magnifying glass to observe the printed matter sometimes reveals that the strokes are blackened. This is no way.