Inkjet process for three-dimensional relief on tiles

A method for operating a system for forming a three-dimensional (3D) relief in a substrate, the method comprising:

• applying, by a digital inkjet printer of the system, binder ink to a first region of a surface of the substrate to form a protective barrier over the first region of the surface of the substrate based on a relief pattern;
• applying, by the digital inkjet printer, solvent ink to the substrate to cause at least some of the binder ink to sink into the substrate such that the protective barrier is at a gradient depth relative to the surface of the substrate;
• and
• brushing, by a mechanical brusher of the system, the substrate to remove material from an unprotected second region of the substrate to form the 3D relief.