发明授权
US4682216A Color image picture forming process and apparatus which improves the
quality of the black portions of the picture
失效
彩色图像图像形成处理和装置，其提高图像的黑色部分的质量
- 专利标题： Color image picture forming process and apparatus which improves the quality of the black portions of the picture
- 专利标题（中）： 彩色图像图像形成处理和装置，其提高图像的黑色部分的质量
-
申请号： US585234申请日： 1984-03-01
-
公开(公告)号： US4682216A公开(公告)日： 1987-07-21
- 发明人: Takashi Sasaki , Nobuaki Sakurada , Hideaki Kawamura , Jiro Moriyama
- 申请人： Takashi Sasaki , Nobuaki Sakurada , Hideaki Kawamura , Jiro Moriyama
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX58-37696 19830308; JPX58-37697 19830308; JPX58-37699 19830308; JPX59-6930 19840118
- 主分类号： B41M1/18
- IPC分类号： B41M1/18 ; H04N1/50 ; H04N1/60 ; G03F3/08 ; G01D15/16 ; H04N1/40 ; H04N1/46
摘要：
Color image picture forming process and apparatus can provide a picture with smooth shadow portions without false contours. When a black component of a color picture data is smaller than a predetermined value, the black component is expressed by using the combination of cyan, magenta and yellow colorants. When the black component is larger than the predetermined value, it is expressed by alternately using the black colorant and the three colorant combination. In another embodiment, picture quality can be enhanced by using a black colorant having a higher density than the cyan, magenta and yellow colorants.
公开/授权文献
- US5683665A Composition and process for cleansing exhaust gas 公开/授权日：1997-11-04
信息查询
