JPS56140350A - Method and device for removing under color - Google Patents

Method and device for removing under color

Info

Publication number
JPS56140350A
JPS56140350A JP4426880A JP4426880A JPS56140350A JP S56140350 A JPS56140350 A JP S56140350A JP 4426880 A JP4426880 A JP 4426880A JP 4426880 A JP4426880 A JP 4426880A JP S56140350 A JPS56140350 A JP S56140350A
Authority
JP
Japan
Prior art keywords
amount
grayness
color
black
inputted
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.)
Granted
Application number
JP4426880A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6250015B2 (enrdf_load_stackoverflow
Inventor
Toshihiro Shimizu
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.)
Toppan Inc
Original Assignee
Toppan Printing 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
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP4426880A priority Critical patent/JPS56140350A/ja
Publication of JPS56140350A publication Critical patent/JPS56140350A/ja
Publication of JPS6250015B2 publication Critical patent/JPS6250015B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • H04N1/6022—Generating a fourth subtractive colour signal, e.g. under colour removal, black masking

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
JP4426880A 1980-04-03 1980-04-03 Method and device for removing under color Granted JPS56140350A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4426880A JPS56140350A (en) 1980-04-03 1980-04-03 Method and device for removing under color

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4426880A JPS56140350A (en) 1980-04-03 1980-04-03 Method and device for removing under color

Publications (2)

Publication Number Publication Date
JPS56140350A true JPS56140350A (en) 1981-11-02
JPS6250015B2 JPS6250015B2 (enrdf_load_stackoverflow) 1987-10-22

Family

ID=12686760

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4426880A Granted JPS56140350A (en) 1980-04-03 1980-04-03 Method and device for removing under color

Country Status (1)

Country Link
JP (1) JPS56140350A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173838A (en) * 1981-03-11 1982-10-26 Hell Rudolf Dr Ing Gmbh Method of removing foundation color and reproducing colored original picture through four-color process printing
JPS58220566A (ja) * 1982-06-16 1983-12-22 Matsushita Giken Kk 色修正用演算装置
JPS58221572A (ja) * 1982-06-17 1983-12-23 Matsushita Giken Kk 記録信号発生装置
JPS5967559A (ja) * 1982-10-08 1984-04-17 Canon Inc カラ−プリンタ
JPS59161981A (ja) * 1983-03-06 1984-09-12 Canon Inc 画像処理装置
US5673335A (en) * 1992-08-26 1997-09-30 Canon Kabushiki Kaisha Color image processing method and apparatus therefor
US6088477A (en) * 1992-08-26 2000-07-11 Canon Kabushiki Kaisha System for controlling an amount of undercolor removal based on a grayness signal, a darkness signal, and a black signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4985912A (enrdf_load_stackoverflow) * 1972-12-22 1974-08-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4985912A (enrdf_load_stackoverflow) * 1972-12-22 1974-08-17

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173838A (en) * 1981-03-11 1982-10-26 Hell Rudolf Dr Ing Gmbh Method of removing foundation color and reproducing colored original picture through four-color process printing
JPS58220566A (ja) * 1982-06-16 1983-12-22 Matsushita Giken Kk 色修正用演算装置
JPS58221572A (ja) * 1982-06-17 1983-12-23 Matsushita Giken Kk 記録信号発生装置
JPS5967559A (ja) * 1982-10-08 1984-04-17 Canon Inc カラ−プリンタ
JPS59161981A (ja) * 1983-03-06 1984-09-12 Canon Inc 画像処理装置
US5673335A (en) * 1992-08-26 1997-09-30 Canon Kabushiki Kaisha Color image processing method and apparatus therefor
US6088477A (en) * 1992-08-26 2000-07-11 Canon Kabushiki Kaisha System for controlling an amount of undercolor removal based on a grayness signal, a darkness signal, and a black signal

Also Published As

Publication number Publication date
JPS6250015B2 (enrdf_load_stackoverflow) 1987-10-22

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