| US 7,616,360 B2 | ||
| Image processing apparatus and method therefor | ||
| Ritsuko Otake, Kawasaki (Japan); Shinichi Kato, Kawasaki (Japan); Tsutomu Sakaue, Yokohama (Japan); Yoko Sato, Yokohama (Japan); and Yoichi Kashibuchi, Tokyo (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jul. 27, 2006, as Appl. No. 11/460,466. | ||
| Claims priority of application No. 20050224595 (JP), filed on Aug. 02, 2005. | ||
| Prior Publication US 2007/0030500 A1, Feb. 08, 2007 | ||
| Int. Cl. G03F 3/08 (2006.01); G06F 15/00 (2006.01); G06K 9/00 (2006.01) | ||
| U.S. Cl. 358—518 [358/1.9; 358/529; 382/167] | 19 Claims |
| 1. An image processing apparatus comprising:
an input section, arranged to input an image signal representing a combination of colors including base colors and a spot
color;
a comparator, arranged to calculate a sum of signal values of colors in each pixel of the image signal, and to compare the
sum of the signal values with a limit value; and
a replacement section, arranged to, when the sum exceeds the limit value, replace signal values of the base colors with a
signal value of the spot color based on a replacement table for replacing the signal values of the base colors with the signal
value of the spot color,
wherein the replacement table includes a relationship of replacement with the signal value of the spot color, and in addition
a combination of the signal values of the base colors except black and a relationship of replacement with a signal value of
black, and
wherein said replacement section comprises a decider arranged to decide which of replacement with the spot color and replacement
with black takes priority.
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