Jiugongge was originally used as a boundary paper for learning calligraphy. Draw a well-shaped square in the box and divide it into nine squares evenly, so that you can grasp the dotted line or zoom in and out when writing. Tian Zige Mi Zige had the same effect.
Draw a grid line on the original image according to the above method, and then draw a grid in proportion where it is to be engraved. If you want to enlarge 100 times, each grid of the original is one inch square, and the place to be engraved is one foot square. The finer the grid, the more accurate the replication.