What techniques does paper-cutting use to carve out the blank outside the main picture and connect the reserved lines with each other?

It is a positive engraving technique used in paper-cutting art, which engraves the blank outside the main picture and connects the reserved lines with each other.

Frontal paper-cutting is to cut off the parts other than the pattern and keep the original points, lines and faces of the pattern, that is, to keep the pattern of cattle and form a red picture and blank. Generally speaking, the paper-cutting of engraving requires pen-to-pen connection. The characteristic of orthographic paper-cutting is to keep the outline of the manuscript, cut off the blank parts outside the outline, and connect the lines.

In traditional paper-cutting, there are few ways to completely use negative engraving or positive engraving, and most of them are a combination of the two ways. Generally, the outline of the main pattern is cut out by positive engraving first, and then the decorative trimming of negative engraving is carried out, so that there is a negative engraving in the positive engraving and a positive engraving in the negative engraving.