Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1993-10-29
1995-05-16
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358500, 358504, 358406, 356243, H04N 100, H04N 146, G01J 102
Patent
active
054166136
ABSTRACT:
A method of calibrating the response of the printer to an image described in terms of colorimetric values, including the steps of: a) setting printer parameters; b) deriving a printer response characteristic by printing a calibration test from device dependent printer signals stored in a device memory, the calibration image including a plurality of color patches, some of which may be repeated at a plurality of locations on the test image at spatially disparate locations selected to keep local printer non-uniformities from affecting both locations; c) measuring printer response characteristics in device independent terms; d) generating a memory mapping of device independent colors to printer responses for subsequent use in printing images defined in device independent terms. The calibration target includes a large number of patches generated from combinations of printer colorants, and may repeat some of those patches either on the same sheet or on a plurality of sheets at positions on the sheet which are spatially distinct.
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Maltz Martin S.
Rolleston Robert J.
Stinehour Judith E.
Coles Sr. Edward L.
Costello Mark
Esposo Allan A.
Xerox Corporation
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