Measuring color and calibrating printers
AssigneeHewlett-Packard Indigo B.V.
InventorsSagi Yehonatan Refael, Pavel Blinchuk, Iliya Shahamov
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Abstract
Methods of measuring colours, methods of calibrating printers and printing systems for implementing the methods are disclosed. Calibration maps are printed on print media. The calibration maps have intertwined contiguous printed and non-printed areas. One or more colour signals are measured on contiguous printed areas. One or more noise signals are measured on non-printed areas that are adjacent to the contiguous printed areas. Clear colour signals are generated by removing the one or more measured noise signals from the one or more measured colour signals.
Claims15
A method of measuring color, comprising:
- printing a calibration map on a print medium, the calibration map having a first contiguous printed area intertwined with a non-printed area;
- measuring one or more color signals on the first contiguous printed area;
- measuring one or more noise signals on the non-printed area;
- generating a clear color signal by removing the one or more measured noise signals from the one or more measured color signals.
A method for calibrating a printer, comprising:
- printing a calibration map on a print medium, the calibration map having intertwined contiguous printed and non-printed areas, the printed areas printed with one or more colors;
- scanning each contiguous area printed with the same color to collect one or more color values, respectively;
- scanning each non-printed area adjacent to each contiguous area to collect one or more noise values, respectively;
- calculating one or more clear color signal as a function of the collected color values, the collected noise values and a reference noise value, respectively;
- calibrating the one or more colors in response to the calculated one or more clear color signals, respectively.
A print system comprising:
- a printing module to print a calibration map on a print medium based on initial color uniformity instructions, the calibration map having intertwined contiguous printed and non-printed areas;
- an inline image capture assembly to measure one or more color signals on the contiguous printed areas of the calibration map and one or more noise signals on the non-printed areas adjacent to the contiguous printed area of the calibration map;
- a processing unit to receive the one or more color signals and the one or more noise signals and generate one or more clear color signals by removing the one or more measured noise signals from the one or more measured color signals, respectively;
- a calibration module to modify the color uniformity instructions of the printing module based on the one or more clear color signals generated by the processing unit.
Dependencies are inferred from the claim text.