A method and a plant (i.e., system or assembly) for manufacturing ceramic products comprising the steps of feeding a mixture of ceramic powders so as to obtain a powder material strip; compacting the powder material strip so as to obtain a compacted powder layer; acquiring a surface image of the compacted powder layer that reproduces the respective surface chromatic effects; processing said surface image so as to obtain a graphic decoration to be applied on the surface of the compacted powder layer that is coordinated with the respective chromatic effects in the thickness; and printing the graphic decoration on the surface of the compacted powder layer.