Method for compensating for defective printing nozzles in inkjet printing
AssigneeHeidelberger Druckmaschinen AG
InventorBernd Stritzel
Life of this patent
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Abstract
A method for carrying out a printing operation on an inkjet printing machine compensates for failed printing nozzles by using a computer. After a screening process in which a halftone image is created for an image to be printed, failed printing nozzles are compensated for by increased ink application from neighboring printing nozzles by precalculating at least one corrective halftone image for the adjacent printing nozzles by using the computer, replacing the halftone image created in the screening process by the corrective halftone image in the at least one column of the neighboring printing nozzles, and carrying out the printing operation on the inkjet printing machine using the corrected halftone.
Claims5
A method for carrying out a printing operation on an inkjet printing machine while compensating for failed printing nozzles by using a computer, the method comprising the following steps:
- after a screening process in which a halftone image is created for an image to be printed, compensating for failed printing nozzles by increased ink application from adjacent printing nozzles, by:
- precalculating at least one corrective halftone image for the adjacent printing nozzles by using the computer;
- replacing the halftone image created in the screening process with the corrective halftone image in at least one column of the adjacent printing nozzles;
- replacing at least two columns of the adjacent printing nozzles both left and right of the failed printing nozzle in the halftone image as viewed in a printing direction with at least two different precalculated corrective halftone images;
- and
- carrying out the printing operation on the inkjet printing machine using the corrected halftone image.
Dependencies are inferred from the claim text.