Title:
METHOD AND SYSTEM FOR REPRODUCING GRADATION FOR LASER PRINTER
Document Type and Number:
Japanese Patent JP3775457
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reproduce an accurate gradation by quantizing the image values for the pixel of an image with an image value scale of a plurality of levels having a maximum image value, correcting the printer value to be approximated to a second space mean and applying a marking medium by a quantity approximately proportional to the printer value.
SOLUTION: A CMYK data generated at a color matching step 510 of a method 500 is processed at a dot gain compensation step 515 and the highlight region and the high/intermediate tone region of an image are light colored before a pixel data is filtered. Following to a font definition step 523, a font set is defined for the cell dimensions defined at a definition step 520. Subsequently, the data is delivered to a multilevel halftoning step 525 to obtain a region having a spatially averaged printer value equal to a spatially averaged scanner value and each component of a corrected CMYK data is mapped to a value within a range suitable for use in a printer engine 540.
Inventors:
Joseph Shoe
Andrey Pascovic
Chasin Lee
Andrey Pascovic
Chasin Lee
Application Number:
JP36419597A
Publication Date:
May 17, 2006
Filing Date:
December 17, 1997
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
B41J2/52; B41J2/44; H04N1/40; H04N1/405; H04N1/407; (IPC1-7): B41J2/52; B41J2/44; H04N1/407
Domestic Patent References:
| JP8195886A |
Attorney, Agent or Firm:
Wilfort International Patent Office
Teruyuki Uemura
Miyagawa Nagao
Teruyuki Uemura
Miyagawa Nagao
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