Printing system, printing apparatus and printing control method

Details Printing system, printing apparatus and printing control method Printing system, printing apparatus and printing control method

1998-09-25

2001-02-13

Lee, Thomas D. (Department: 2724)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S296000, C358S451000, C358S535000

Reexamination Certificate

active

06188491

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a printing system, which is composed of a computer and a printing apparatus connected via a communication line, a printing apparatus and a printing control method.
A problem that can occur in a color printing apparatus is misregistration of color planes in an output image caused by the mechanisms for the printing and paper transport functions. In the prior art, this is dealt with by correcting the print data in the printer controller using a dither matrix that dots grow in longitudinal direction (hereinafter longitudinal-growth dither matrix).
Further, when data is binarized and transmitted to a printing apparatus by a client computer that processes the data, the computer corrects the print data using a longitudinal-growth dither matrix as the dither matrix used in binarization.
However, since the dither matrix used at the time of binarization processing in the printing apparatus or client computer in the above-described prior art is a unique longitudinal-growth dither matrix that corresponds to the printing orientation (portrait or landscape) and the direction in which the paper is transported, appropriate measures for dealing with misregistration cannot be implemented in regard to the orientation of the print data and the paper transport direction.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a printing system, printing apparatus and printing control method whereby a dither matrix for dealing with misregistration of color planes can be formed in dependence upon printing orientation and paper transport direction.
Another object of the present invention is to perform high-quality printing by rotating a reference dither matrix through a predetermined angle in dependence upon printing orientation and paper transport direction to form a dither matrix for dealing with misregistration of color planes, and using this dither matrix in binarization processing.
According to the present invention, the foregoing object is attained by providing a printing system composed of a computer and a printing apparatus connected via a communication line, wherein the computer includes forming means for forming a dither matrix, which is employed in binarization processing to deal with misregistration of color planes, in dependence upon printing orientation and paper transport direction; and binarization means for binarizing print data using the dither matrix formed by the forming means; the printing apparatus printing print data that has been corrected, by the computer, for misregistration of color planes.
Further, according to the present invention, the foregoing object is attained by providing a printing apparatus comprising: forming means for forming a dither matrix, which is employed in binarization processing to deal with misregistration of color planes, in dependence upon printing orientation and paper transport direction; binarization means for binarizing print data using the dither matrix formed by the forming means; and printing means for printing print data that has been binarized by the binarization means.
Further, according to the present invention, the foregoing object is attained by providing a printing control method comprising: a forming step of forming a dither matrix, which is employed in binarization processing to deal with misregistration of color planes, in dependence upon printing orientation and paper transport direction; a binarization step of binarizing print data using the dither matrix formed by the forming step; and a printing control step of controlling printing of print data that has been binarized by the binarization step.


REFERENCES:
patent: 5416612 (1995-05-01), Ingraham et al.
patent: 5627919 (1997-05-01), Kemmochi
patent: 5777757 (1998-07-01), Karlsson et al.
patent: 5903713 (1999-05-01), Daels et al.
patent: 5995713 (1999-11-01), Lee

Affiliated with

Also associated with

Rating

Printing system, printing apparatus and printing control method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Printing system, printing apparatus and printing control method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printing system, printing apparatus and printing control method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2576819