Besides silk screen printing and thermal transfer printing, what other simple leather printing processes are there?

At present, the printing process of leather on the market is as follows:

Traditional printing

Like screen printing?

Digital printing

A. leather direct spraying process

Coil for direct injection of this weak solvent? There is also a direct injection tablet machine.

B.PET film transfer printing

This is a transfer printing process with PET release film, which is suitable for real leather.