Methods and apparatus for real time calibration of a marking engine in a print system
First Claim
1. A print system for printing a print job, the print job comprising a print target scale corresponding to a specified image parameter having a range of possible renderings set forth in a printed table, the print system comprising:
- a circuit coupled to a marking engine, the circuit comprising a look-up table comprising calibration data, the circuit adapted to receive print data for the print job and transform the print data based on the calibration data in the look-up table;
a means for comparing a sample rendering of the print target scale with a rendering in the printed table;
a means for modifying, in real time and to match a desired rendering, the calibration data in the look-up table; and
means for transmitting the modified input image data to the marking engine for rendering the remainder of the print job.
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Accused Products
Abstract
Methods and apparatus are disclosed for modifying the rendered output of a marking engine for a print job in progress. A marking engine commences printing print data for a print job. A parameter of a printed page of the print job is measured while the marking engine prints the print job. The measured parameter is compared to a reference, and the print data are modified before the print job completes, such that all subsequent portions of the print job are rendered with modified print data.
91 Citations
14 Claims
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1. A print system for printing a print job, the print job comprising a print target scale corresponding to a specified image parameter having a range of possible renderings set forth in a printed table, the print system comprising:
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a circuit coupled to a marking engine, the circuit comprising a look-up table comprising calibration data, the circuit adapted to receive print data for the print job and transform the print data based on the calibration data in the look-up table;
a means for comparing a sample rendering of the print target scale with a rendering in the printed table;
a means for modifying, in real time and to match a desired rendering, the calibration data in the look-up table; and
means for transmitting the modified input image data to the marking engine for rendering the remainder of the print job. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A print system for printing a print job, the system comprising:
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a print adapter coupled to a source of input data for the print job and to a marking engine, the print adapter comprising a look-up table;
a metering agent coupled to the output of the marking engine, the metering agent adapted to measure a color balance of the output;
a monitor device coupled to the metering agent, the monitor device adapted to monitor a parameter affecting the measured color balance;
a means for adjusting, in real time, color mapping data for rendering the print job in progress, in proportion to a difference between the monitored parameter and a reference value; and
a means for downloading adjusted values of the color mapping data to the look-up table, such that marking engine continues the print job in progress using input image data modified by the adjusted color mapping data in the look-up table. - View Dependent Claims (9, 10, 11, 12)
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13. A method for correcting the output of a marking engine, the method comprising:
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receiving print data for a print job;
commencing printing the print job by the marking engine;
measuring a parameter of a printed page of the print job while the marking engine prints the print job;
comparing the measured parameter to a reference; and
modifying print data before completion of the print job, such that all subsequent portions of the print job are rendered with modified print data. - View Dependent Claims (14)
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Specification