The implementation method of original color classification in sample printing is that the original is usually divided into CMYK four colors. If it is a color drawing or color photo, it is almost difficult to select the color on thousands of pictures. Therefore, the four-color printing method is usually used. That is, the original is color decomposed, divided into four-color (CMYK) color plates before printing, and the color is synthesized in the process. The traditional "color separation" is mainly a color separation process based on the principle of subtraction through the selection and absorption characteristics of different wavelengths of color. In this way, the color is filtered to form supplementary light, so that the photosensitive film forms a negative film of black-and-white image, and then screening to form a dot.
Due to the extensive application of enterprises, the above color separation methods are no longer used in modern printing technology. Now we decompose the original into RGB three colors through the digital technology of prepress scanning and sampling transformation, and realize color separation by computer digital calculation and processing into CMYK.
The reasons and advantages of image screening, the solid-state determination of printing equipment determines that printing can only use dot to reproduce the continuous tone level of the original. If we have experience, we will find that the image is a pattern image composed of a large number of dots.
Because it occupies a space position of the same size, although the image dot size is not necessarily the same, in order to avoid such process defects, we screen the original image and express the color depth of the image through the dot size in the dot.
The spatial position and size of the outlets determine the sense of hierarchy of the product. When the number of screens is higher, the smaller the spatial position occupied by the outlets. On the contrary, the larger the position occupied, the fewer levels that can be described, and the coarser the printed products. In fact, the color and level of the original before printing are reproduced after hanging the net in this form.济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/