Image processing apparatus, print control apparatus, method...

Details Image processing apparatus, print control apparatus, method... Image processing apparatus, print control apparatus, method...

2005-06-07

2005-06-07

Bella, Matthew C. (Department: 2676)

Computer graphics processing and selective visual display system

Computer graphics processing

Attributes

C345S589000, C345S591000, C345S597000, C345S603000, C345S604000

Reexamination Certificate

active

06903747

ABSTRACT:
The technique of the present invention carries out color conversion of first image data expressed by a first color system into second image data expressed by a second color system. The procedure first collects multiple adjoining pixels of the first image data into one block, and calculates a tone difference of the first image data in the block based on the first image data of the respective pixels. When the calculated tone difference is less than a preset value, procedure carries out collective color conversion without discrimination of the respective pixels included in the block. This enables the high-speed color conversion. When the calculated tone difference is not less than the preset value, on the other hand, the procedure carries out color conversion by a unit of each pixel included in the block. This prevents deterioration of the picture quality. The technique of the invention thus ensures the high-speed color conversion without deteriorating the picture quality.

REFERENCES:
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 5596428 (1997-01-01), Tytgat et al.
patent: 5742410 (1998-04-01), Suzuki
patent: 5847850 (1998-12-01), Kadowaki
patent: 0452066 (1991-10-01), None
patent: 08-307717 (1996-11-01), None
patent: 11-088683 (1999-03-01), None
patent: 2000-184194 (2000-06-01), None
Notification of Reason for Rejection, Japanese Patent Office, Patent Application No.: 2001-238097, Representative/Applicant: Meisei International Patent Firm, Dispatch Date: Jun. 22, 2004.

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