Setting printer parameters

A system for setting printer parameters, comprising:

• a print medium, comprising:
• a print surface, and
• an identification code on the print surface, the identification code comprising multiple surface property discontinuities on the print surface, wherein the print surface is continuous at the multiple surface property discontinuities, and wherein the multiple surface property discontinuities are non-additive and are grouped together at a location on the print surface;
• and
• a printer, comprising:
• a light source directable or directed towards the print medium when loaded in the printer,
• an optical sensor directable or directed towards the print medium to optically detect reflected discontinuities in the surface property at the identification code,
• an electro-optical converter to convert optical information related to the reflected discontinuities into electrical signal, and
• a controller to receive the electric signal and to set an operating parameter of the printer based on the electrical signal.

A system for setting printer parameters, comprising:

• a print medium, comprising:
• a print surface, and
• an identification code on the print surface, the identification code comprising multiple surface property discontinuities on the print surface, wherein the print surface is continuous at the multiple surface property discontinuities, and wherein the multiple surface property discontinuities are non-additive and are grouped together at a location on the print surface;
• a printer, comprising:
• a mechanical contact sensor to contact the print medium when loaded in the printer and to mechanically detect discontinuities in the surface property at the identification code;
• an electro-mechanical converter to convert mechanical information related to the discontinuities into electrical signal;
• and
• a controller to receive the electrical signal and to set an operating parameter of the printer based on the electrical signal.