What is overprinting, overprinting, trapping, embossing?

Overprinting: refers to the overlapping registration of multi-color printing when the various color printing patterns are required;

Trapping: refers to a color block and another color block convergence should have a certain overlap and overlap, in order to avoid the printing of white edges, it is also called dew white; two color transfer place may not be in the trapping time There is a shift in the printing, resulting in white edges or aliasing. The trapping is to infiltrate the two points of the transfer at the point of transfer, and no white edges will be produced.

Embossing and overprinting mean one color patch over another. However, when printing, special attention should be paid to the overprinting of the black text on the color image. Do not hollow out the pattern under the black text. Otherwise, the black text will show white edges.

Example: Four P's grandnesses of 16 open, made with PS, texts with K100, sent to the film center to tell the black characters are not imprinted, that is, the position of the black characters is hollow on other color plates, will result in overprinting Inaccurate and revealing, the overprinting of the black text in PS is to change the layer mode of the black text layer to a multiplicity, so that in other color versions, the black characters are not hollowed out, and thus, there will be no white appearance. The situation has just entered the printing industry and like to use PS design friends must pay attention to this issue. Do not, we must develop PS to do the bottom map, CD or AI typing good habits. There will be no glitches on printed text.

Black in general CD and PM are default embossing.

1. Are all bitmaps trapped or trapped? Because some customers directly gave us a bitmap (some bitmaps are quite complex) files, output proofing, did not find any unacceptable phenomenon.

A: Unusual ~~~ overprinting can be as long as K100's black or graphics
2. How thick should the lines be overprinted to register the color and print? A trace (0.01 mm) enough? How much does it turn into pt units?

A: The very thin line ~~ is 0.2 points. 1pt=0.35146mm

3. Do overprinting in CD and ILL. Are they all the same in principle? It seems that the thickness of the overprint in the ILL line is half of the line, is it not? What's on the CD?
A: No such statement.

4. Is it safer than CD to do overprinting in ILL?

A: Do it in the normal way. Software is just a tool, with no good or safer points
5 spot color overprint, spot color and black, specifically, black, is not overprinted with lines? Spot color and black, special, black, is not using padding? If you want to prevent the appearance of "black and black" patterns, can you just overprint them? Or what other method? Or do you need to overprint possible color registrations? Is the spot color a transparent attribute? That spot color can't be overprinted with spot colors, can only be overprinted with lines?

A: Relatively speaking, the lines are overprinted better.

6. Assume some kind of overprint


Assume that in the ILL, a pattern with a red fill in the middle, a green outline line, and a green fill pattern underneath. Can the line be overprinted (with a green outline line in the same layer as red and filled with green underneath for overprinting)?

Answer: No need to do overprinting. Normal output can

7. If it's just CMYK, the pattern is similar to the color insert in "The Cartoon King", or the cartoon in "Cat and Mouse". The animated characters have black lines and are used to indicate their outlines. Do you have to do overprinting with such a complicated figure? It is difficult to imagine a color block, a color block for overprinting? ! If you do not make overprints, how do you print those anime magazines?

A: Again, under normal circumstances only black overprint, other colors normal output.
8. If the black outline on the artwork given to me is made by the method of “leaking black” (for example, a strip of red, green, and black under the seam), is this artwork not? "Can only hook it up again, and then make overprints," is this not too sad?

A: The seam below is a piece of black to do overprinting.

In fact, overprinting is very simple, remember that you can: in general, only black or black graphics do overprint processing, other colors default normal output ~

If it is a multi-million-dollar printing vehicle like Heidelberg, there will be no overprinting problem at all. However, according to the national conditions of the country, many printers do not have such good equipment. Therefore, there is an inaccurate printing press and overprinting. phenomenon.

When stacking strokes, it is generally based on experience. A large area of ​​filling strokes should be set to a thicker point, 0.1 to 0.2 mm is appropriate, and small areas filled with strokes should be relatively fine. After the strokes are folded, observing the printed matter with a magnifying glass sometimes reveals that the strokes are darkened. This is impossible.