Method and system for providing closed loop color control betwee

Details Method and system for providing closed loop color control betwee Method and system for providing closed loop color control betwee

1989-05-17

1992-04-21

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 75, H04N 146

Patent

active

051073323

ABSTRACT:
A method and system for continuously correcting for errors in color output of a color copier or printer and caused by events that occur between the input of a color image scanner and the output of a copier or printer driven thereby. This method and system includes, among other things, the continuous comparison of input test pattern data, TP.sub.in, from a small color gamut or "patch" having only a selected few number of color pixels therein with the output test pattern data, TP.sub.out, from a color printer or copier to generate a color correction conversion factor, H. Then, H is used to continuously update an initial full scale look up table which was initially prepared from a full scale color gamut. The initial look up table has a color conversion factor, F.sub.old, and H is used to convert F.sub.old to F.sub.new where F.sub.new =H.multidot.F.sub.old. In this manner, H continuously corrects for undesirable changes in parameters used to generate the initial look up table, such as quality of print media, ink, dye loading, ink drop volume, pen types and the calibration of system devices.

REFERENCES:
patent: 4727425 (1988-02-01), Mayne et al.
patent: 4752822 (1988-06-01), Kawamura
patent: 4805013 (1989-02-01), Dei et al.
patent: 4839772 (1989-06-01), Barry et al.
patent: 4901258 (1990-02-01), Akiyama
patent: 4929978 (1990-05-01), Kanamori et al.

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