// Ticket item indicating what image resolution to use. message DpiTicketItem {
// Horizontal DPI to print at (required). optional int32 horizontal_dpi = 1; // Vertical DPI to print at (required). optional int32 vertical_dpi = 2; // Vendor-provided ID of the Dpi option. Needed to disambiguate Dpi options // that have the same DPI values, but may have a different effect for the // printer. optional string vendor_id = 3;
}