Facsimile and static presentation processing – Natural color facsimile – Color photography previewer
Patent
1991-10-25
1994-03-08
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Color photography previewer
358406, 358455, H04N 140, H04N 146
Patent
active
052935396
ABSTRACT:
Apparatus and associated methods for providing accurate tone reproduction in an output image, specifically in terms of dot gain curve shape and scale, through a DDCP imaging chain (such as that implemented by a raster image processor (200), particularly a screening process (460) occurring therein, and a marking engine (130)) used in a direct digital color proofing (DDCP) system (100), based upon "Process" data (600) associated with that imaging chain and customer defined ("Aim") data (500). Specifically, monotonically interpolated, e.g. using monotone piecewise cubic interpolation, "Aim" and "Process" data for "all possible" inputs are determined from corresponding input "Aim" and "Process" data and then combined to yield a customized dot gain look-up table (460) that, for a given operating condition, reflects the "Aim" data modified by the inverse of the "Process" data, i.e. the latter reflecting the native dot gain characteristic of this imaging chain which occurs at that condition. Thereafter, incoming contone values for a proof image are routed through the look-up table to yield resulting modified values which, when subsequently printed by the DDCP imaging chain at that operating condition, will yield a proof image that exhibits only a desired "Aim" dot gain curve, without substantially any corruption, if at all, from the native dot gain characteristic of that chain. By obtaining and then interpolating appropriate "Process" and/or desired "Aim" data, for a common operating condition and then constructing a look-up table therefrom, the DDCP imaging chain can produce a proof image that, within physical limits occurring at that operating condition, will accurately exhibit only the desired "Aim" dot gain curve and hence the desired tone reproduction characteristic associated therewith.
REFERENCES:
patent: 4657831 (1987-04-01), Ambro et al.
patent: 4708459 (1987-11-01), Cowan et al.
patent: 4816863 (1989-03-01), Lee
patent: 4926254 (1990-05-01), Nakatsuka et al.
patent: 5018085 (1991-05-01), Smith, Jr.
F. N. Fritsch et al, "Monotone Piecewise Cubic Interpolation", SIAM Journal of Numerical Analysis, vol. 17, No. 2, Apr. 1980, pp. 238-246.
J. A. C. Yule, Principles of Color Reproduction (.COPYRGT.1967: John Wiley & Sons, Inc., New York), specifically pp. 205-216 of Chapter 8 "Additivity and Proportionality of Densities".
Coles Sr. Edward L.
Eastman Kodak Company
Randall Robert L.
Rogers Scott A.
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