WO2007084566A3 - Color and darkness management system - Google Patents

Color and darkness management system Download PDF

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Publication number
WO2007084566A3
WO2007084566A3 PCT/US2007/001240 US2007001240W WO2007084566A3 WO 2007084566 A3 WO2007084566 A3 WO 2007084566A3 US 2007001240 W US2007001240 W US 2007001240W WO 2007084566 A3 WO2007084566 A3 WO 2007084566A3
Authority
WO
WIPO (PCT)
Prior art keywords
darkness
level
selected pixel
input
output
Prior art date
Application number
PCT/US2007/001240
Other languages
French (fr)
Other versions
WO2007084566A2 (en
Inventor
Edward M Granger
Original Assignee
Iq Colour Llc
Edward M Granger
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 US11/336,202 external-priority patent/US20070171441A1/en
Priority claimed from US11/336,203 external-priority patent/US20070171442A1/en
Application filed by Iq Colour Llc, Edward M Granger filed Critical Iq Colour Llc
Publication of WO2007084566A2 publication Critical patent/WO2007084566A2/en
Publication of WO2007084566A3 publication Critical patent/WO2007084566A3/en

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
    • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Color Image Communication Systems (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

The present invention provides a color and darkness management system, method, apparatus and software for determining colorant values for reproduction of an image on an output medium having a minimum darkness, and with the reproduction has a maximum black colorant darkness on the output medium. An exemplary apparatus embodiment comprises a memory and a processor. The processor is adapted, when an input darkness level of a selected pixel is greater than a first predetermined darkness level, to nonlinearly constrain an output black darkness of the selected pixel to a value less than or equal to the lesser of the input darkness level and the maximum darkness; when the input darkness level of the selected pixel is less than a second predetermined level, to nonlinearly constrain the output black darkness of the selected pixel to a value greater than or equal to the greater of the input darkness level and the minimum darkness; and otherwise to determine the output black darkness of the selected pixel as a substantially linear mapping from the input darkness level.
PCT/US2007/001240 2006-01-21 2007-01-17 Color and darkness management system WO2007084566A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11/336,202 US20070171441A1 (en) 2006-01-21 2006-01-21 Color and darkness management system
US11/336,203 2006-01-21
US11/336,203 US20070171442A1 (en) 2006-01-21 2006-01-21 Color and neutral tone management system
US11/336,202 2006-01-21

Publications (2)

Publication Number Publication Date
WO2007084566A2 WO2007084566A2 (en) 2007-07-26
WO2007084566A3 true WO2007084566A3 (en) 2007-11-22

Family

ID=38288212

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2007/001268 WO2007084581A2 (en) 2006-01-21 2007-01-17 Color and neutral tone management system
PCT/US2007/001240 WO2007084566A2 (en) 2006-01-21 2007-01-17 Color and darkness management system

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2007/001268 WO2007084581A2 (en) 2006-01-21 2007-01-17 Color and neutral tone management system

Country Status (1)

Country Link
WO (2) WO2007084581A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5596428A (en) * 1994-05-26 1997-01-21 Agfa-Gevaert N.V. Color matching by systems calibration, linear and non-linear gamut mapping
US5748858A (en) * 1993-11-17 1998-05-05 Fuji Photo Film Co., Ltd. Method of and system for predicting reproduced color image
US5943143A (en) * 1993-06-22 1999-08-24 Canon Kabushiki Kaisha Image processing system having color adjusting features
US6057931A (en) * 1993-07-12 2000-05-02 Mci Telecommunications Corporation Method and apparatus for controlling color image reproduction

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6459501B1 (en) * 1998-04-06 2002-10-01 Joseph Holmes Small-gamut colorant set

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5943143A (en) * 1993-06-22 1999-08-24 Canon Kabushiki Kaisha Image processing system having color adjusting features
US6057931A (en) * 1993-07-12 2000-05-02 Mci Telecommunications Corporation Method and apparatus for controlling color image reproduction
US5748858A (en) * 1993-11-17 1998-05-05 Fuji Photo Film Co., Ltd. Method of and system for predicting reproduced color image
US5596428A (en) * 1994-05-26 1997-01-21 Agfa-Gevaert N.V. Color matching by systems calibration, linear and non-linear gamut mapping

Also Published As

Publication number Publication date
WO2007084581A3 (en) 2008-03-06
WO2007084581A2 (en) 2007-07-26
WO2007084566A2 (en) 2007-07-26

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