In the spotlight: Debossing
Debossing is the process that presses part of the image down into the metal wall of the can. This creates a structure on the can surface.
Debossing tooling consist of a pair of rollers which both have design elements engraved on them. The male tool (on the outside of the can) has the deboss elements of the image raised, while the female tool (inside the can) has the same elements recessed.
Debossing is achieved when the male tool presses the metal wall of the can inside creating the bespoke structure.