US 7,320,510 B2
Image processing method and image processing apparatus
Takashi Nakamura, Yokohama (Japan); Akihiko Nakatani, Kawasaki (Japan); Minako Kato, Kawasaki (Japan); Rie Kajihara, Yokohama (Japan); Naoki Sumi, Kawasaki (Japan); Shigeyasu Nagoshi, Yokohama (Japan); Makoto Torigoe, Setagaya-ku (Japan); and Okinori Tsuchiya, Yokohama (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Jul. 27, 2006, as Appl. No. 11/460,412.
Claims priority of application No. 2005-218725 (JP), filed on Jul. 28, 2005.
Prior Publication US 2007/0024656 A1, Feb. 01, 2007
Int. Cl. B41J 2/205 (2006.01)
U.S. Cl. 347—15  [358/1.2; 358/1.9; 358/520] 25 Claims
OG exemplary drawing
 
1. An image processing method for generating density signals corresponding to at least achromatic dots and second kind chromatic dots, the second kind chromatic dots being in the same color as or a similar color to first kind chromatic dots and having a smaller size or a lower density than the first kind chromatic dots, the method comprising:
performing image processing to generate at least density signals corresponding to the achromatic dots and the second kind chromatic dots respectively for forming a monochrome image, the density signals being generated, based on a luminance signal corresponding to the monochrome image, so that the density signal corresponding to the achromatic dots has a larger value than the density signal corresponding to the second kind chromatic dots in an entire range of the luminance signal.