The sharpness of letterpress printing is a problem that people are more concerned about, so in the actual printing process, how to ensure the printing sharpness of letterpress printing?
If the density difference between adjacent layers is large, the visual experience is clear. The contrast of the layer boundary can be emphasized during the color separation, which will create an illusion of improvement, and the contrast of the subtle layers can be substantially enhanced.
The solidity (ie sharpness) of the original layer boundary should be used as the basis. In the whole process of copying and reproduction, the transition width of the boundary of the image layers should be gradually widened, especially for enlarged copying. The level boundary solidity cannot be restored. The clarity of the layered boundaries of the print only appears to be accentuated by the color separation reproduction.
The so-called texture. The printed matter is based on the resolution of the fine level of the original image, but it is damaged by the resolution of the plate-making optics, the magnification, the thickness of the screen and the registration of the four-color plate. After the process of plate making and printing, the fineness of the original level cannot be restored.
