Printing techniques to hide swath boundary banding
AssigneeHewlett-Packard Company
InventorsDan Arquilevich, William S. Osborne, Tod S. Heiles, Mun Yew Lee
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Abstract
The present invention provides a dynamic adjustment for black ink volume to print a black object whose height is greater than one swath of the inkjet printer. The black ink volume is increased by using a greater number of nozzles compared to the number of nozzles used to print color or a second fluid for underprinting the black ink.
Claims20
A method performed by an inkjet printer, for printing a black object having a height that is greater than a swath height of the inkjet printer, said printer moving one or more printheads relative to a medium while said one or more printheads are printing on said medium, said one or more printheads including a first set of nozzles for printing dots of a first fluid, and a second set of nozzles for printing dots of a second fluid, said second fluid for interacting with said first fluid on said medium;
- said method comprising:
- adjusting a volume of the first fluid, wherein the first fluid is black ink and is printed over the second fluid, and the black ink volume is greater than a volume of the second fluid, wherein the volume of black ink is increased by increasing a number of nozzles in the first set of nozzles compared to a number of nozzles in the second set of nozzles.
An apparatus in an inkjet printer comprising:
- one or more printheads including a first set of nozzles for printing a first fluid, and a second set of nozzles for printing a second fluid, said second fluid for interacting with said first fluid on a medium;
- wherein the first set of nozzles includes a greater number of nozzles than the second set of nozzles for printing a black object having a height that is greater than a swath height of the printer;
- a detector for detecting a characteristic within said printer;
- and
- a controller for varying a volume of said first fluid, wherein the first fluid is black ink used for printing the black object.
In an image printing system that sequentially applies to print media adjacent first and second swaths having a common boundary, wherein each swath comprises a swath height of underprinted fluid and a swath height of black image fluid that is applied substantially over the underprinted fluid, a method of preventing swath boundary banding comprising the steps of:
- printing a swath height of underprinted fluid and a swath height of black image fluid in locations on the media where the image represented by the printed black image fluid does not extend across the common swath boundary;
- and
- increasing the printed swath height of black image fluid relative to the printed swath height of underprinted fluid in locations where the image represented by the printed black image fluid extends across the common swath boundary.
Dependencies are inferred from the claim text.