US 12,076,975 B2
Plate-making method, plate-making system and can body
Kenichiro Yamamoto, Tokyo (JP); Ryota Nagatsuka, Tokyo (JP); Keisuke Sanuki, Tokyo (JP); Iori Takatori, Kanagawa (JP); and Yukiko Saito, Kanagawa (JP)
Assigned to TOYO SEIKAN CO., LTD., Tokyo (JP)
Filed by Toyo Seikan Co., Ltd., Tokyo (JP)
Filed on Mar. 24, 2022, as Appl. No. 17/703,283.
Application 17/703,283 is a continuation of application No. PCT/JP2020/038003, filed on Oct. 7, 2020.
Claims priority of application No. 2019-186724 (JP), filed on Oct. 10, 2019; and application No. 2019-186725 (JP), filed on Oct. 10, 2019.
Prior Publication US 2022/0212461 A1, Jul. 7, 2022
Int. Cl. B41C 1/12 (2006.01); B41C 1/18 (2006.01); H04N 1/52 (2006.01); B41M 1/40 (2006.01)
CPC B41C 1/12 (2013.01) [B41C 1/18 (2013.01); H04N 1/52 (2013.01); B41M 1/40 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A plate-making method for manufacturing a printing plate based on image data separated into each of colors and representing halftone dots, the plate-making method comprising:
manufacturing the printing plate based on a knockout method in which knockouts of halftone dots in one color are formed, and halftone dots in the other color are overprinted onto positions of the knockouts;
for each of pixels, when a sum of a halftone dot area ratio of the one color and a halftone dot area ratio of the other color is smaller than 100%, forming a gap from a knockout in the one color around a halftone dot in the other color; and
for each of pixels, when the sum of the halftone dot area ratio of the one color and the halftone dot area ratio of the other color is greater than 100%, forming an overmask such that the halftone dot in the other color penetrates a periphery of the halftone dot in the one color.