We keep updating our Windows Utility driver to enhance the functionality of the Utility Driver and the latest version now supports Gray Scale Printing (SK1-211/311 and SK4-21/31 only). We see many of Kiosk applications start using some graphical print data such as face photo or some nicer shop logos on the receipts and tickets. Using the Gray Scale Printing function, those graphical printing looks nicer and more precise.
Utility driver page
The Gray Scale Printing function requires the following firmware version on the printer side.
SK1-211/311 Series V2.52.00 or higher
SK4-31 Series V1.01.00 or higher