What is the function of overprinter in printing? How to use it?

Overprinting and embossing are the same meaning, that is, overprinting one color block on another. However, when printing, special attention should be paid to the overprint of black characters on color images, and the patterns under the black characters should not be hollowed out, otherwise the black characters will have white edges when the overprint is incorrect.

For example, the four P's are made of 16 and PS, and the text is K 100. It is sent to the distribution center to inform that the black text has no relief, that is, the position of the black text is hollowed out on other color plates, which will lead to overprint and inaccurate exposure. In PS, black text overlay changes the layer mode of black text layer to positive film overlay, so that black text in other swatches is not hollowed out. It won't be exposed. Friends who have just entered the printing industry and like to design with PS must pay attention to this problem. In addition, they should develop the good habit of using PS as basemap, CD or AI typing. In this way, the printed text will not have burrs.