Method for calibrating a color marking engine for halftone operation
View Patent ↗Methods are described for calibrating a virtual printer including a plurality of color marking engines. The methods include printing a test pattern on one of the marking engines, the test pattern including a plurality of test patches, each test patch including corresponding expected colorimetric values, reading the test pattern with a colorimeter to determine measured colorimetric values associated with each of the test patches, and creating a lookup table that maps the measured colorimetric values to the expected colorimetric values.
1. A method for calibrating a virtual printer comprising a plurality of color marking engines, each color marking engine adapted to print multiple colorants, each of the color marking engines adapted to receive raster image data from a single raster image processor, the raster image data color balanced to a system color space, the method comprising:
printing a test pattern on one of the marking engines, the test pattern comprising a plurality of test patches, each test patch comprising corresponding expected colorimetric values;
reading the test pattern with a colorimeter to determine measured colorimetric values associated with each of the test patches; and
creating a lookup table that maps the measured colorimetric values to the expected colorimetric values.
2. The method of claim 1 , wherein the test patches comprise cyan, magenta and yellow colorants.
3. The method of claim 1 , wherein each test patch is associated with a corresponding toner density.
4. The method of claim 1 , wherein the test pattern comprises 256 test patches per colorant.
5. The method of claim 1 , wherein the colorimetric values comprise XYZ values.
6. The method of claim 1 , further comprising:
printing a test pattern on each of the marking engines;
reading each test pattern with a colorimeter to determine measured colorimetric values associated with each of the test patches; and
creating a corresponding lookup table for each marking engine, each lookup table mapping the corresponding measured colorimetric values to the expected colorimetric values.
7. A method for creating a calibration lookup table for a virtual printer comprising a plurality of color marking engines, each color marking engine adapted to print multiple colorants, each of the color marking engines adapted to receive raster image data from a single raster image processor, the raster image data color balanced to a system color space, the method comprising:
printing a test pattern on one of the marking engines, the test pattern comprising a plurality of test patches, each test patch comprising corresponding expected colorimetric values;
reading the test pattern with a colorimeter to determine measured colorimetric values associated with each of the test patches; and
mapping the measured colorimetric values to the expected colorimetric values.
8. The method of claim 7 , wherein the test patches comprise cyan, magenta and yellow colorants.
9. The method of claim 7 , wherein each test patch is associated with a corresponding toner density.
10. The method of claim 7 , wherein the test pattern comprises 256 test patches per colorant.
11. The method of claim 7 , wherein the colorimetric values comprise XYZ values.
12. The method of claim 7 , further comprising:
printing a test pattern on each of the marking engines;
reading each test pattern with a colorimeter to determine measured colorimetric values associated with each of the test patches; and
creating a corresponding lookup table for each marking engine, each lookup table mapping the corresponding measured colorimetric values to the expected colorimetric values.