A printer control unit (3) is described for controlling the size of droplets emitted by a nozzle of a printhead (8) in an inkjet printer. The control unit (3) receives information about an image to be printed by the printer, for example from a raster image processor (5), the information including dr
A printer control unit (3) is described for controlling the size of droplets emitted by a nozzle of a printhead (8) in an inkjet printer. The control unit (3) receives information about an image to be printed by the printer, for example from a raster image processor (5), the information including droplet size information regarding the size of droplet required to be emitted by the nozzle to print the image. Print parameter information for printing the image is determined on the basis of the received droplet size information, the print parameter information including information for use in setting the printer such that droplets emitted by the nozzle during the printing of the image have the required droplet size.
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1. A printer control unit for controlling the size of droplets emitted by all nozzles of a printhead in an inkjet printer, the printer control unit comprising: means for receiving information regarding an image to be printed by the printer, the information including droplet size information regardin
1. A printer control unit for controlling the size of droplets emitted by all nozzles of a printhead in an inkjet printer, the printer control unit comprising: means for receiving information regarding an image to be printed by the printer, the information including droplet size information regarding a single required size of the droplets to be emitted by all the nozzles to print the image, the single required size of the droplets selected from a plurality of different droplet sizes;means for determining, on the basis of the received droplet size information, print parameter information for printing the image;the print parameter information including information regarding the printer settings for which droplets emitted by all the nozzles during the printing of the image have the single required droplet size. 2. The printer control unit according to claim 1, further including means for transmitting the print parameter information to the printer for setting the printer to print the image using the single required size of the droplets. 3. The printer control unit according to claim 1, wherein the means for determining the print parameter information comprises means for retrieving predetermined print parameter information associated with the single required size of the droplets from a memory. 4. The printer control unit according to claim 1, wherein the means for determining the print parameter information comprises means for calculating printer settings on the basis of the single required size of the droplets. 5. The printer control unit according to claim 1, wherein the print parameter information includes information regarding printer settings. 6. The printer control unit according to claim 1, wherein the print parameter information includes information regarding the printing pulse for emitting the single required size of the droplets. 7. The printer control unit according to claim 1, adapted to control the size of droplets emitted, the print parameter information for setting the printer including information for use in setting all the nozzles to emit droplets having the single required size of the droplets. 8. The printer control unit according to claim 1, further including means for determining the printer settings used for printing a previous image. 9. The printer control unit according to claim 8, wherein the means for determining the printer settings used for printing the previous image includes means for comparing the required drop size information with drop size information for the previous image. 10. The printer control unit according to claim 1 arranged to receive the droplet size information from a raster image processor. 11. An apparatus including the printer control unit according to claim 1 and a raster image processor (RIP) means. 12. The apparatus according to claim 11, the RIP being adapted to transmit, information regarding an image to be printed, wherein the information includes droplet size information regarding the single required size of the droplets to be emitted by the printhead to print the image. 13. The apparatus according to claim 11 including means for receiving into the RIP information regarding the single required size of the droplets for the image to be printed. 14. The printer control unit according to claim 1, further comprising means for identifying that no droplet size information is available, and determining information relating to default settings for printing the image. 15. An apparatus according to claim 1, wherein the inkjet printer and the printhead are arranged to receive print parameter information from the printer control unit. 16. A raster image processor (RIP), preferably for use in association with the printer control unit according to claim 1, the RIP being adapted to output information regarding an image to be printed, wherein the information includes droplet size information regarding the single required size of the droplets size of droplet. 17. A method of controlling the size of droplets emitted by all nozzles of a printhead in an inkjet printer, the method comprising: receiving information regarding an image to be printed by the printer, the information including droplet size information regarding a single required size of the droplets to be emitted by all the nozzles to print the image, the single required size of the droplets selected from a plurality of different droplet sizes;determining, on the basis of the required droplet size information, print parameter information for printing the image; andusing the print parameter information to set the printer for printing the image so that the droplets emitted by all the nozzles have the single required droplet size. 18. The method according to claim 17, further including the step of transmitting the print parameter information to the printer. 19. A method for controlling droplet size of droplets emitted by all nozzles of a printhead in an inkjet printer during printing of an image, the method comprising: receiving at an image processor a droplet size input and an image input, the droplet size input identifying a single required size of the droplets to be used to print an entirety of the image the single required size of the droplets selected from a plurality of different droplet sizes;translating the image input into initial print instructions in accordance with the droplet size input using the image processor, the initial print instructions are not printer specific;allocating to all the nozzles of the printhead the pixels to be printed by each one of the nozzles based on the initial print instructions, the allocation is specific to the printhead and includes nozzle arrangement of the printhead;generating a print job file based on the initial print instructions and the allocation of pixels to the nozzles of the printhead, the print job file including printer specific print instructions for printing the image by the printer;inputting the print job file to a printer control unit of the printer;identifying the droplet size input included in the print job file using the printer control unit;identifying printer settings required to print the image with the single required droplet size specified in the droplet size input using the printer control unit; andprinting the image based on the print job file and the droplet size input included therein.
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이 특허에 인용된 특허 (1)
James S. Newkirk ; Rodney L. Miller, Method and apparatus for increasing number of available printing gradations on an ink jet printer.
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