Group of measured fields for determining color data of a printed

Details Group of measured fields for determining color data of a printed Group of measured fields for determining color data of a printed

1995-01-30

1998-06-02

Boudreau, Leo

Image analysis

Applications

Document or print quality inspection

382167, 358517, 358504, 101211, 101484, G06K 900, H04N 146, B41F 3300

Patent

active

057613273

ABSTRACT:
A group of measured fields (as well as a process for using the measured fields) is provided for determining color data of a printed product, especially for color management in the rotary offset printing of single editions, with a plurality of measured fields, which are printed on a printed product to be checked or on a primary print in such a way that they can be optically scanned. The group of measured fields includes a first combination measured field, in which the fundamental colors are superprinted with their nominal degrees of surface coverage (F.sub.c1, F.sub.m1, F.sub.y1). Additional combination measured fields are provided, in which the fundamental colors are superprinted at varied nominal degrees of surface coverage {(F.sub.c2 =F.sub.c1 +.DELTA.F.sub.c2, F.sub.m1, F.sub.y1), (F.sub.c1, F.sub.m3 =F.sub.m1 +.DELTA.F.sub.m3, F.sub.y1), (F.sub.c1, F.sub.m1, F.sub.y4 =F.sub.y1 +.DELTA.F.sub.y4)}, wherein each fundamental color is varied at least once, and at least one other fundamental color is varied in each additional combination measured field. Additionally at least one single-color full-tone field is provided for each fundamental color. Further, at least one single-color half-tone field is provided for each fundamental color, wherein first single-color half-tone fields have, in their corresponding fundamental color, a degree of surface coverage (F.sub.c1, F.sub.m1, F.sub.y1) that corresponds to that of the same color in the first combination measured field, and/or second single-color half-tone fields have, in their corresponding fundamental color, a degree of surface coverage (F.sub.c2, F.sub.m3, F.sub.y4) that corresponds to the varied degree of surface coverage of the same color in the additional combination measured fields.

REFERENCES:
patent: 4852485 (1989-08-01), Brunner
patent: 4967379 (1990-10-01), Ott
patent: 4975862 (1990-12-01), Keller et al.
patent: 5068810 (1991-11-01), Ott
patent: 5206707 (1993-04-01), Ott
patent: 5317425 (1994-05-01), Spence et al.
patent: 5333069 (1994-07-01), Spence
patent: 5602970 (1997-02-01), Janser

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