JPS6447174A - Method for converting color - Google Patents

Method for converting color

Info

Publication number
JPS6447174A
JPS6447174A JP62203768A JP20376887A JPS6447174A JP S6447174 A JPS6447174 A JP S6447174A JP 62203768 A JP62203768 A JP 62203768A JP 20376887 A JP20376887 A JP 20376887A JP S6447174 A JPS6447174 A JP S6447174A
Authority
JP
Japan
Prior art keywords
color
alpha
color component
picture element
data
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
JP62203768A
Other languages
Japanese (ja)
Other versions
JP2624967B2 (en
Inventor
Kazuhiro Chiba
Noriko Kojima
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62203768A priority Critical patent/JP2624967B2/en
Priority to GB8806182A priority patent/GB2202708B/en
Priority to US07/168,942 priority patent/US4887150A/en
Priority to DE3808818A priority patent/DE3808818A1/en
Publication of JPS6447174A publication Critical patent/JPS6447174A/en
Application granted granted Critical
Publication of JP2624967B2 publication Critical patent/JP2624967B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To attain the color conversion of satisfactory color reproductivity by separating a picture element to an achromatic color component and a color component, independently executing the conversion of these achromatic color component and color component and after that, synthesizing two color converting data. CONSTITUTION:For R, G and B video signals inputted from input terminals 1-3, a minimum value alpha is outputted per picture element by a minimum value calculator 4. A subtractor 5 executes the subtraction of R-alpha, G-alpha and B-alpha and these three subtracted values show the quantity of the color component of this picture element. A multiplier 7 executes matrix operation concerning the color component of the picture element with using a color converting coefficient matrix outputted from a coefficient generator 6 and calculates Y1, M1 and C1 signals. An ROM8 outputs color converting data Y2, M2 and C2 to correspond to the inputted alpha value. A synthesizer 9 respectively executes the addition of the two color converting data, which are the data Y1, M1 and C1 and the data Y2, M2 C2 and outputs them as Y, M and C printing signals. Thus, the color conversion of the satisfactory reproductivity can be executed.
JP62203768A 1987-03-16 1987-08-17 Color conversion method Expired - Fee Related JP2624967B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP62203768A JP2624967B2 (en) 1987-08-17 1987-08-17 Color conversion method
GB8806182A GB2202708B (en) 1987-03-16 1988-03-16 Color converting device
US07/168,942 US4887150A (en) 1987-03-16 1988-03-16 Device for converting video image signals to printing data signals
DE3808818A DE3808818A1 (en) 1987-03-16 1988-03-16 DEVICE FOR CONVERTING COLORS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62203768A JP2624967B2 (en) 1987-08-17 1987-08-17 Color conversion method

Publications (2)

Publication Number Publication Date
JPS6447174A true JPS6447174A (en) 1989-02-21
JP2624967B2 JP2624967B2 (en) 1997-06-25

Family

ID=16479494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62203768A Expired - Fee Related JP2624967B2 (en) 1987-03-16 1987-08-17 Color conversion method

Country Status (1)

Country Link
JP (1) JP2624967B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5436739A (en) * 1991-12-03 1995-07-25 Ricoh Company, Ltd. Color correction system for transforming color image from one color space to another
US5588050A (en) * 1993-08-27 1996-12-24 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for performing color conversion
US5870491A (en) * 1989-08-31 1999-02-09 Canon Kabushiki Kaisha Image processing apparatus which controls processing conditions of an image signal on detected features of the image signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55142342A (en) * 1979-04-23 1980-11-06 Dainippon Screen Mfg Co Ltd Digital color tone control method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55142342A (en) * 1979-04-23 1980-11-06 Dainippon Screen Mfg Co Ltd Digital color tone control method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870491A (en) * 1989-08-31 1999-02-09 Canon Kabushiki Kaisha Image processing apparatus which controls processing conditions of an image signal on detected features of the image signal
US5436739A (en) * 1991-12-03 1995-07-25 Ricoh Company, Ltd. Color correction system for transforming color image from one color space to another
US5588050A (en) * 1993-08-27 1996-12-24 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for performing color conversion
US5729636A (en) * 1993-08-27 1998-03-17 Mitsubishi Denki Kabushiki Kaisha Method and apparatus for performing tone conversion

Also Published As

Publication number Publication date
JP2624967B2 (en) 1997-06-25

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees