Facsimile and static presentation processing – Facsimile – Image reproduction system
Patent
1993-03-22
1994-09-13
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Image reproduction system
358406, 358455, 358501, 358504, 358521, 364526, H04N 140, H04N 123, H04N 146
Patent
active
053473698
ABSTRACT:
A method for calibrating a printer determines a tone reproduction curve for the printer. A plurality of bands of different accurate gray level standards and a corresponding number of smoothly increasing sequences of gray level specifications for the printer are printed adjacent to one another. Adjacent bands and sequences are compared, and a point along each band where the band appears equal to the adjacent gray level specification sequence is determined. The points are interpolated and the interpolated values are used to form a tone reproduction curve for the printer. The tone reproduction curve, representing the correspondence between the gray level specification of the printer and the actual gray levels produced by the printer, can then be used to calibrate the printer. The calibrating method can also be used for color printers.
REFERENCES:
patent: 3489849 (1970-01-01), Hedger
patent: 4075662 (1978-02-01), Gall
patent: 4422098 (1983-12-01), Logie et al.
patent: 4751377 (1988-06-01), Ishizaka et al.
patent: 4941057 (1990-07-01), Lehmbeck et al.
patent: 5165074 (1992-11-01), Melino
Rogers Scott A.
Xerox Corporation
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