JPS6445642A - Converting method for color - Google Patents

Converting method for color

Info

Publication number
JPS6445642A
JPS6445642A JP62201825A JP20182587A JPS6445642A JP S6445642 A JPS6445642 A JP S6445642A JP 62201825 A JP62201825 A JP 62201825A JP 20182587 A JP20182587 A JP 20182587A JP S6445642 A JPS6445642 A JP S6445642A
Authority
JP
Japan
Prior art keywords
ink
color
chromaticity
segment
maximum
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
JP62201825A
Other languages
Japanese (ja)
Other versions
JP2688200B2 (en
Inventor
Hideaki Mitsutake
Hidejiro Kadowaki
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 JP62201825A priority Critical patent/JP2688200B2/en
Publication of JPS6445642A publication Critical patent/JPS6445642A/en
Application granted granted Critical
Publication of JP2688200B2 publication Critical patent/JP2688200B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Image Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Ink Jet (AREA)

Abstract

PURPOSE:To suitably reproduce the color of an image corresponding to the chromaticity value of an input color signal by employing the chromaticity value corresponding to the case when monochromatic ink, 2-color ink are mixed in equal amounts and maximum amount of achromatic ink is added in hue scale in an equivalent color space. CONSTITUTION:C, M, Y, R, G and B represent chromaticity values of colors corresponding to the maximum densities. Assume that a point (A) is a color actually desired to be expressed, if a point of crossing a half line passing an origin and the point (A) across a hexagon is (B), the quantity of yellow ink is given by a ratio of a segment -(B)M segment -RM when the quantity of magenta ink is 1. If the chromaticity values of the intensity minimum in which maximum mount of black is added to magenta M and red R are M', R' and points of crossing a segment -MR and -M'R' across a half plane (C) representing hue direction are (D), (E), the chromaticity values of the (D), (E) can be easily obtained by an interior dividing method. When the chromaticity value of an image carrier is (F) and the chromaticity value of the case that only black ink is applied at the maximum limit is (G), the quantity of the chromatic ink and the quantity of the achromatic ink can be determined by the interior dividing method.
JP62201825A 1987-08-14 1987-08-14 Image processing method Expired - Lifetime JP2688200B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62201825A JP2688200B2 (en) 1987-08-14 1987-08-14 Image processing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62201825A JP2688200B2 (en) 1987-08-14 1987-08-14 Image processing method

Publications (2)

Publication Number Publication Date
JPS6445642A true JPS6445642A (en) 1989-02-20
JP2688200B2 JP2688200B2 (en) 1997-12-08

Family

ID=16447522

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62201825A Expired - Lifetime JP2688200B2 (en) 1987-08-14 1987-08-14 Image processing method

Country Status (1)

Country Link
JP (1) JP2688200B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402253A (en) * 1992-08-20 1995-03-28 Fuji Xerox Co., Ltd. Color conversion method and apparatus with a variable gray component replacement ratio

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010251A (en) * 1983-06-30 1985-01-19 Canon Inc Color reproducing system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6010251A (en) * 1983-06-30 1985-01-19 Canon Inc Color reproducing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5402253A (en) * 1992-08-20 1995-03-28 Fuji Xerox Co., Ltd. Color conversion method and apparatus with a variable gray component replacement ratio

Also Published As

Publication number Publication date
JP2688200B2 (en) 1997-12-08

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term