Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1997-03-18
2000-06-06
Au, Amelia
Facsimile and static presentation processing
Static presentation processing
Attribute control
382162, H04N 152
Patent
active
060725885
ABSTRACT:
Cumulative histograms generated based on threshold matrixes with respect to halftone-dot area percentage data of the four plates C, M, Y, K are referred to for thereby determining the existential probability of halftone dots. Then, average colorimetric data are calculated from predetermined colorimetric data with respect to every 2.sup.n colors using the area percentage as a weighting coefficient. An anti-aliasing filtering process is effected on the average colorimetric data to produce device-independent image data for a color printer. The cumulative histograms are emphasized and the average colorimetric data are emphasized to accurately reproduce a peculiar pattern such as a rosette image which will appear on a printed document on a proof which is outputted from a low-resolution color printer. A process is provided for changing the halftone-dot area percentage data based on the type (wood-free paper, art paper, or the like) of paper of a print sheet of the printed document and the halftone-dot area percentage data on presensitized plates, when the halftone-dot area percentage data are converted into bit map data for the color printer, for thereby reproducing "impression irregularity" and "harshness" out of the visual irregular qualities of paper.
REFERENCES:
patent: 4792979 (1988-12-01), Nomura et al.
patent: 5475509 (1995-12-01), Okamoto
patent: 5734801 (1998-03-01), Noguchi et al.
patent: 5760920 (1998-06-01), Lin et al.
Ahmed Samir
Au Amelia
Fuji Photo Film Co. , Ltd.
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