Facsimile and static presentation processing – Natural color facsimile – Measuring – testing – and calibrating
Patent
1994-03-25
1995-09-19
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Measuring, testing, and calibrating
358518, 358406, H04N 100, H04N 146, G03F 308
Patent
active
054521122
ABSTRACT:
A method of calibrating a color image reproduction system in the field is provided. The color image reproduction system includes a color input scanner for generating a color digital image, a digital image processor for applying a color transform to the color digital image to produce a transformed color digital image and, and a digital color printer for printing the transformed color digital image. The calibration method includes the steps of: a) providing a set of calibration tools developed on a representative system, the tools including a scanning target, a first reference file recording the response of a scanner to the scanning target in the representative system, an image file for producing a test pattern, and a second reference file recording the response of the scanner in the representative system to the test pattern printed on the printer in the representative system; and b) employing the calibration tools to calibrate the color image reproduction system in the field, by: 1) scanning the scanning target in the color scanner to produce a first test file; 2) employing the first test file and the first reference file, to generate a scanner calibration table; 3) sending the image file to the color printer to produce a second test pattern; 4) scanning the second test pattern in the color scanner and processing the output of the color scanner through the scanner calibration table to produce a second test file; and 5) employing the second test file and the second reference file to generate a printer calibration table.
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Leone Anthony J.
Wan Shijie
Close Thomas H.
Coles Sr. Edward L.
Eastman Kodak Company
Williams Kimberly A.
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