Facsimile and static presentation processing – Natural color facsimile – Measuring – testing – and calibrating
Patent
1998-01-29
2000-10-31
Williams, Kimberly A.
Facsimile and static presentation processing
Natural color facsimile
Measuring, testing, and calibrating
358518, H04N 146, G03F 308
Patent
active
061411205
ABSTRACT:
A printer calibration method and system uses a personal computer equipped with a color laser server circuit card and a scanner to measure the color effects specific to a printer and to then calibrate print data to adjust for the measured printer effects. Each printer colorant is calibrated by printing a data file using the printer to be calibrated thereby generating a calibration image. The calibration image is next scanned using a scanner coupled to the printing system. The scanned data is compared to the data file which was sent to the printer to determine the relationship (an association) between the data file printed and the resulting calibration image. Color comparisons are made using an absolute density scale and thus the scanned data, being in RGB (Red, Blue, Green) format is converted to absolute density values. To determine the conversion from scanned RGB values to absolute density, a standard gray scale test strip is scanned and compared to a data file containing the known absolute density values which correspond to the test strip.
REFERENCES:
patent: 5416613 (1995-05-01), Rolleston et al.
patent: 5809213 (1998-09-01), Bhattacharjya
patent: 5818960 (1998-10-01), Gregory, Jr. et al.
Splash Technology, Inc.
Williams Kimberly A.
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