There are differences between Zhu Wen and Bai in seal cutting, composition and layout, so it is not suitable to directly convert black and white. If such a seal is used, the overall effect of calligraphy works will be destroyed, and the loss will outweigh the gain.
As far as technology is concerned, in actual operation, it is impossible to directly process the seal with ps without magic wand, and it can be selected by color gradation function, but the essence of operation is the same as magic wand selection, except that special color separation software such as Jinchang software is relatively simple to operate, but such software is very expensive.