Movable type printing is one of the four great inventions in ancient China. The development of movable type printing is the foundation of the rapid development of ancient Chinese books. Together with compass, gunpowder and papermaking, it is called the four great inventions of ancient China. Color printing is the reproduction of an image or text in color (as opposed to monochrome printing). It involves many steps, or conversion processes, to produce high-quality color copies. Color printing
Printing on the same sheet of paper with different colors of plates, the effect of color screen will be text, pictures, photos and other originals through plate making, ink application, stamping and other processes, so that the ink will be transferred to the surface of paper, fabric, leather and other materials, bulk copy of the original content technology.
Color printing is a direct or indirect method, which uses the original system of image or text as the printing plate, spreads the color ink on the printing plate, transfers the color ink to paper or other substrate after pressurization, and copies it in batches rapidly.
Nowadays, color printing is generally used in lithography.
Photolithography is sometimes called chemical printing, which means that the printed image and plate are on the same plane. It is based on the principle of "oil and water do not mix". This kind of color printing is to print the image on the stone or metal surface by machine or hand, and then carry out chemical treatment on it, so that one part of the image is inky, and the rest of the blank part is inky. In printing technology, only the part that likes ink will be transferred to paper, so as to produce impression. Photoprinting, photocopying and offset are all lithography.
Color separation processing: color separation processing is a digital scanning of the original, which is divided into three parts: red, green and blue.
Mesh: printing ink does not mix. Therefore, only one color of ink can be printed on paper at a time. Different colors are closely printed together, resulting in a visual fusion, giving the audience a concept of constantly adjusting the image. To separate colors from each other, you can use screen segmentation to achieve this goal. The resulting dots are also called halftones or grid tones.