DE3531086C2 - - Google Patents

Info

Publication number
DE3531086C2
DE3531086C2 DE3531086A DE3531086A DE3531086C2 DE 3531086 C2 DE3531086 C2 DE 3531086C2 DE 3531086 A DE3531086 A DE 3531086A DE 3531086 A DE3531086 A DE 3531086A DE 3531086 C2 DE3531086 C2 DE 3531086C2
Authority
DE
Germany
Prior art keywords
image
color
density
values
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE3531086A
Other languages
German (de)
English (en)
Other versions
DE3531086A1 (de
Inventor
Yoshihiro Tokio/Tokyo Jp Sakai
Itsuo Sagamihara Kanagawa Jp Ikeda
Katsuo Yokohama Kanagawa Jp Sakai
Tsukasa Hoya Tokio/Tokyo Jp Adachi
Satoshi Kawaguchi Saitama Jp Singuryo
Hideya Yokohama Kanagawa Jp Furuta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP59181459A external-priority patent/JPS6159970A/ja
Priority claimed from JP59194259A external-priority patent/JPS6172260A/ja
Priority claimed from JP59194258A external-priority patent/JPH0614214B2/ja
Priority claimed from JP59198368A external-priority patent/JPS6177060A/ja
Priority claimed from JP59203806A external-priority patent/JPH0614215B2/ja
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of DE3531086A1 publication Critical patent/DE3531086A1/de
Application granted granted Critical
Publication of DE3531086C2 publication Critical patent/DE3531086C2/de
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
    • H04N1/4078—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture using gradational references, e.g. grey-scale test pattern analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/50—Picture reproducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/50—Picture reproducers
    • H04N1/506—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction
    • H04N1/508—Reproducing the colour component signals picture-sequentially, e.g. with reproducing heads spaced apart from one another in the subscanning direction using the same reproducing head for two or more colour components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/52—Circuits or arrangements for halftone screening
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/6016—Conversion to subtractive colour signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
  • Facsimile Image Signal Circuits (AREA)
DE19853531086 1984-08-30 1985-08-30 Verfahren zur herstellung von farbigen elektrophotographischen kopien Granted DE3531086A1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP59181459A JPS6159970A (ja) 1984-08-30 1984-08-30 カラ−電子複写機における色補正方法
JP59194259A JPS6172260A (ja) 1984-09-17 1984-09-17 カラ−電子複写方式における階調性補正方法
JP59194258A JPH0614214B2 (ja) 1984-09-17 1984-09-17 カラ−電子複写方式における階調性補正方法
JP59198368A JPS6177060A (ja) 1984-09-21 1984-09-21 カラ−電子複写方式における色補正方法
JP59203806A JPH0614215B2 (ja) 1984-09-28 1984-09-28 カラ−電子複写方式における階調性補正方法

Publications (2)

Publication Number Publication Date
DE3531086A1 DE3531086A1 (de) 1986-03-06
DE3531086C2 true DE3531086C2 (US20050271598A1-20051208-C00001.png) 1989-10-26

Family

ID=27528804

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853531086 Granted DE3531086A1 (de) 1984-08-30 1985-08-30 Verfahren zur herstellung von farbigen elektrophotographischen kopien

Country Status (4)

Country Link
US (1) US4690541A (US20050271598A1-20051208-C00001.png)
CA (1) CA1242239A (US20050271598A1-20051208-C00001.png)
DE (1) DE3531086A1 (US20050271598A1-20051208-C00001.png)
GB (1) GB2163923B (US20050271598A1-20051208-C00001.png)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61272765A (ja) * 1985-05-28 1986-12-03 Toshiba Corp 画像形成装置
JPH0731443B2 (ja) * 1985-12-05 1995-04-10 株式会社東芝 記録装置
US4791450A (en) * 1985-12-16 1988-12-13 Eastman Kodak Company Multicolor electrophotographic reproduction apparatus and method for producing color accented copies
JPS63173646A (ja) * 1987-01-13 1988-07-18 Ricoh Co Ltd 画像形成装置
GB2206261B (en) * 1987-06-22 1992-02-05 Konishiroku Photo Ind Multicolour image forming method and apparatus
JPH01129270A (ja) * 1987-11-13 1989-05-22 Minolta Camera Co Ltd 複写機
GB8824340D0 (en) * 1988-10-18 1988-11-23 Xerox Corp Colour detection/recognition apparatus
JP2886169B2 (ja) * 1988-11-25 1999-04-26 石原産業株式会社 カラー電子写真方法
US5194878A (en) * 1988-11-25 1993-03-16 Ishihara Sangyo Kaisha Ltd. Color electrophotographic method
JPH02248972A (ja) * 1989-03-22 1990-10-04 Brother Ind Ltd カラー画像形成装置
JP3068628B2 (ja) * 1990-03-22 2000-07-24 キヤノン株式会社 画像処理装置およびその方法
JP4477412B2 (ja) * 2003-07-29 2010-06-09 株式会社リコー ベルト装置とそれを備えた画像形成装置とベルト速度制御方法
JP2005062809A (ja) * 2003-07-31 2005-03-10 Ricoh Co Ltd トナー搬送装置、現像装置、プロセスユニット、画像形成装置、トナー搬送方法及び画像形成方法
US7576509B2 (en) * 2003-09-10 2009-08-18 Ricoh Company, Limited Drive control method, drive control device, belt apparatus, image forming apparatus, image reading apparatus, computer product
JP4568051B2 (ja) * 2003-09-18 2010-10-27 株式会社リコー 画像形成装置
JP2005181711A (ja) * 2003-12-19 2005-07-07 Ricoh Co Ltd 画像形成装置及びプロセスカートリッジ
JP2006251101A (ja) * 2005-03-09 2006-09-21 Ricoh Co Ltd 現像装置、プロセスカートリッジ及び画像形成装置
US7672604B2 (en) * 2005-03-16 2010-03-02 Ricoh Company, Ltd. Image forming apparatus and image forming method using electrostatic transport and hopping

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141328A (US20050271598A1-20051208-C00001.png) * 1974-01-12 1975-11-13
US4122462A (en) * 1974-09-11 1978-10-24 Canon Kabushiki Kaisha Image information recording apparatus
US4051536A (en) * 1975-03-14 1977-09-27 Xerox Corporation Electronic halftone imaging system
US4046472A (en) * 1975-04-18 1977-09-06 Xerox Corporation Electrostatic imaging apparatus
US4153364A (en) * 1977-01-28 1979-05-08 Ricoh Company, Ltd. Exposure and development control apparatus for electrostatic copying machine
DE2857218C3 (de) * 1977-02-23 1989-08-10 Ricoh Kk Verfahren zum Konstanthalten optimaler Bedingungen bei der elektrografischen Vervielfältigung
US4185304A (en) * 1977-07-07 1980-01-22 Xerox Corporation Electronic halftone screening
JPS5430039A (en) * 1977-08-10 1979-03-06 Ricoh Co Ltd Recorder
JPS5489737A (en) * 1977-12-27 1979-07-17 Ricoh Co Ltd Copying machine
JPS5492742A (en) * 1977-12-29 1979-07-23 Ricoh Co Ltd Control method for copier image quality
JPS5630154A (en) * 1979-08-21 1981-03-26 Oki Electric Ind Co Ltd Photoprint head
US4236809A (en) * 1979-09-04 1980-12-02 Xerox Corporation Low resolution correction apparatus and method for electrophotographic copiers
JPS56128947A (en) * 1980-03-13 1981-10-08 Dainippon Screen Mfg Co Ltd Method of setting highlight and shadow point density value of original picture to picture scanning recorder
JPS56133753A (en) * 1980-03-25 1981-10-20 Canon Inc Image trimming device
JPS5875373A (ja) * 1981-10-30 1983-05-07 Fuji Xerox Co Ltd カラ−複写機
DE3334362A1 (de) * 1982-09-25 1984-03-29 Canon K.K., Tokyo Bilderzeugungseinrichtung

Also Published As

Publication number Publication date
US4690541A (en) 1987-09-01
GB2163923B (en) 1988-07-13
DE3531086A1 (de) 1986-03-06
CA1242239A (en) 1988-09-20
GB2163923A (en) 1986-03-05
GB8521468D0 (en) 1985-10-02

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee