JPS6441375A - Gradation and color tone correction system - Google Patents

Gradation and color tone correction system

Info

Publication number
JPS6441375A
JPS6441375A JP62196411A JP19641187A JPS6441375A JP S6441375 A JPS6441375 A JP S6441375A JP 62196411 A JP62196411 A JP 62196411A JP 19641187 A JP19641187 A JP 19641187A JP S6441375 A JPS6441375 A JP S6441375A
Authority
JP
Japan
Prior art keywords
gradation
correction
picture
color
chromaticity
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
JP62196411A
Other languages
Japanese (ja)
Other versions
JP2661917B2 (en
Inventor
Hideaki Mitsutake
Hidejiro Kadowaki
Kenichi Matsumoto
Akihito Hosaka
Takeshi Doi
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62196411A priority Critical patent/JP2661917B2/en
Publication of JPS6441375A publication Critical patent/JPS6441375A/en
Application granted granted Critical
Publication of JP2661917B2 publication Critical patent/JP2661917B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Color Electrophotography (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

PURPOSE:To reduce the effect of various kinds of unevenness by drawing a standard color patch used for gradation correction or color correction onto plural positions on a picture medium by one color and one gradation, reading the chromaticity such as R, G, B density of the standard color patch and applying gradation or color correction through the use of the chromaticity. CONSTITUTION:A picture pattern generating circuit 106 prints out the standard color patch used for gradation or color correction to plural locations corresponding to plural different regions by one color and one gradation. A reflectance detection circuit 109, at the test mode, applies reflectance measurement (detection of scattered light) of a test pattern picture on a picture medium outputted by a printer control section 108, reads the RGB, YMC density and chromaticity to calculate the picture processing parameter (correction parameter) of the picture signal processing circuit 105. Then an arithmetic section 11 uses the reflectance (chromaticity) measured by reflected light detection sections 110A, 110B to calculate the correction parameter for gradation correction or color correction and outputs to a RAM 102 and the picture signal processing circuit 105. Thus, the effect of the uneven sensitivity is reduced.
JP62196411A 1987-08-07 1987-08-07 Color image processing method Expired - Fee Related JP2661917B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62196411A JP2661917B2 (en) 1987-08-07 1987-08-07 Color image processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62196411A JP2661917B2 (en) 1987-08-07 1987-08-07 Color image processing method

Publications (2)

Publication Number Publication Date
JPS6441375A true JPS6441375A (en) 1989-02-13
JP2661917B2 JP2661917B2 (en) 1997-10-08

Family

ID=16357410

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62196411A Expired - Fee Related JP2661917B2 (en) 1987-08-07 1987-08-07 Color image processing method

Country Status (1)

Country Link
JP (1) JP2661917B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6460151A (en) * 1987-08-31 1989-03-07 Nippon Denki Home Electronics Color image reader
US5574544A (en) * 1994-08-29 1996-11-12 Konica Corporation Image forming apparatus having image density gradation correction means
JP2003084532A (en) * 2001-09-10 2003-03-19 Canon Inc Image forming apparatus color identification method and image forming apparatus
JP2004252172A (en) * 2003-02-20 2004-09-09 Canon Inc Image forming device
US6832825B1 (en) 1999-10-05 2004-12-21 Canon Kabushiki Kaisha Test pattern printing method, information processing apparatus, printing apparatus and density variation correction method
US7099044B2 (en) * 1999-08-27 2006-08-29 Kabushiki Kaisha Toshiba Color image processing apparatus and method and color image forming apparatus and method
JP2007003781A (en) * 2005-06-23 2007-01-11 Fuji Xerox Co Ltd Image forming apparatus
JP2011209693A (en) * 2010-03-12 2011-10-20 Ricoh Co Ltd Image forming apparatus, image forming method, and program

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5754873B2 (en) 2007-08-07 2015-07-29 キヤノン株式会社 Recording control apparatus and calibration method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6460151A (en) * 1987-08-31 1989-03-07 Nippon Denki Home Electronics Color image reader
US5574544A (en) * 1994-08-29 1996-11-12 Konica Corporation Image forming apparatus having image density gradation correction means
US7099044B2 (en) * 1999-08-27 2006-08-29 Kabushiki Kaisha Toshiba Color image processing apparatus and method and color image forming apparatus and method
US6832825B1 (en) 1999-10-05 2004-12-21 Canon Kabushiki Kaisha Test pattern printing method, information processing apparatus, printing apparatus and density variation correction method
JP2003084532A (en) * 2001-09-10 2003-03-19 Canon Inc Image forming apparatus color identification method and image forming apparatus
JP2004252172A (en) * 2003-02-20 2004-09-09 Canon Inc Image forming device
JP2007003781A (en) * 2005-06-23 2007-01-11 Fuji Xerox Co Ltd Image forming apparatus
JP2011209693A (en) * 2010-03-12 2011-10-20 Ricoh Co Ltd Image forming apparatus, image forming method, and program

Also Published As

Publication number Publication date
JP2661917B2 (en) 1997-10-08

Similar Documents

Publication Publication Date Title
JPH01313724A (en) Coloring method by triaxes plane vector color space
KR20040053110A (en) Printing method, printed matter, and printing controller
NO844369L (en) PROCEDURE AND APPARATUS FOR REGULATING COLOR SUPPLY BY A PRESSURE PRINTING MACHINE
SE9302985D0 (en) Thin film thickness monitoring
SE443669B (en) PROCEDURE AND DEVICE FOR PRE-ASSESSMENT OF SAMPLING PROPOSALS FOR TEXTILE, DECOR- OR PACKAGING PRESSURE
JPS6441375A (en) Gradation and color tone correction system
EP0521881B1 (en) Color measurement
EP0177921B1 (en) Method and device for measuring the quantity of water dampening the face of an offset printing plate
KR19990045495A (en) Optical color sensor and color print inspection device
SE443670B (en) PROCEDURE AND DEVICE FOR PREPARING TREASURY
US4555180A (en) Printed area measuring apparatus
US4384337A (en) Zonal ink distribution measuring method and system
JP2008533435A (en) Method and apparatus for metrologically detecting a visually perceived color impression difference between a reference multicolor patterned surface and a test item multicolor patterned surface
EP0749000B1 (en) Method and apparatus for color thickness testing
FI80792B (en) BETRAKTNINGSAPPARATUR AVSEDD FOER PAO COLORIMETRISK FAERGBESTAEMNING BASERAD REPRODUKTION ELLER AVDRAGNING.
GB2189743A (en) Presetting zone inking controls
JP3572178B2 (en) Ink supply control method and apparatus for printing press
JP2786216B2 (en) Picture area ratio measuring device
JPS56120926A (en) Indicating device for measured color
US4375031A (en) Method and device for measuring a degree of exhaustion of photographic processing solutions
JPS6447554A (en) Recording equipment
FI103026B (en) Procedure for measuring and interpreting the print quality in a digital color printer
KR910009110A (en) Convergence Measuring Device
JPS6140159A (en) Flat-bed proof press
JPS56129845A (en) Inspecting method for color filter

Legal Events

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