JPS6411836A - Method of recording color gradation - Google Patents

Method of recording color gradation

Info

Publication number
JPS6411836A
JPS6411836A JP62166976A JP16697687A JPS6411836A JP S6411836 A JPS6411836 A JP S6411836A JP 62166976 A JP62166976 A JP 62166976A JP 16697687 A JP16697687 A JP 16697687A JP S6411836 A JPS6411836 A JP S6411836A
Authority
JP
Japan
Prior art keywords
pattern
dots
patches
dim
yellow
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
JP62166976A
Other languages
Japanese (ja)
Other versions
JP2643942B2 (en
Inventor
Kentaro Matsumoto
Makoto Takaoka
Toyokazu Uda
Akiyoshi Fukumoto
Susumu Sugiura
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 JP62166976A priority Critical patent/JP2643942B2/en
Priority to US07/210,869 priority patent/US4860026A/en
Publication of JPS6411836A publication Critical patent/JPS6411836A/en
Application granted granted Critical
Publication of JP2643942B2 publication Critical patent/JP2643942B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Color, Gradation (AREA)
  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To prevent the deterioration in the image quality by recording color gradation with the employment of one kind of ink for yellow and at least two kinds of inks having different densities for the colors other than yellow, and an image of yellow being larger in size than that of the other colors. CONSTITUTION:To decide the dot pattern for yellow, patches are outputted for all patterns 0-25 in a matrix of 5X5 dots to measure the optical reflecting density (0.D value) thereof which is brought in linear relation with an image data. On the other hand, to decide the dot pattern for magenta, cyan and black, patches are outputted for the pattern of dim dots only, then for the pattern of the combination of dim and medium dots and further for the pattern of the combination of medium and deep dots. The brightness of the outputted patches is measured, and the patches that can be expressed by the dim dot pattern and by the combination pattern of the dim and medium dots are selected in the low-density region, while the patches that can be represented by the combination pattern of the medium and deep dots are selected in the high- density region. The dot pattern decided in the above-described manner is written in each of the dot pattern memories, thus enabling recording of color gradation.
JP62166976A 1987-06-25 1987-07-06 Color gradation recording device Expired - Fee Related JP2643942B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62166976A JP2643942B2 (en) 1987-07-06 1987-07-06 Color gradation recording device
US07/210,869 US4860026A (en) 1987-06-25 1988-06-24 Halftone image recording method using recording data having a plurality of concentrations for one color

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62166976A JP2643942B2 (en) 1987-07-06 1987-07-06 Color gradation recording device

Publications (2)

Publication Number Publication Date
JPS6411836A true JPS6411836A (en) 1989-01-17
JP2643942B2 JP2643942B2 (en) 1997-08-25

Family

ID=15841099

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62166976A Expired - Fee Related JP2643942B2 (en) 1987-06-25 1987-07-06 Color gradation recording device

Country Status (1)

Country Link
JP (1) JP2643942B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6601938B1 (en) 1996-04-23 2003-08-05 Canon Kabushiki Kaisha Ink-jet print method and apparatus
EP1835722A1 (en) * 2006-03-15 2007-09-19 Ricoh Company, Ltd. Setting method, image recording apparatus, program and recording medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59163964A (en) * 1983-03-08 1984-09-17 Canon Inc Color picture forming device
JPS59201862A (en) * 1983-04-28 1984-11-15 Canon Inc Formation of color image
JPS60154073A (en) * 1984-01-24 1985-08-13 Canon Inc Formation of color image

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59163964A (en) * 1983-03-08 1984-09-17 Canon Inc Color picture forming device
JPS59201862A (en) * 1983-04-28 1984-11-15 Canon Inc Formation of color image
JPS60154073A (en) * 1984-01-24 1985-08-13 Canon Inc Formation of color image

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6601938B1 (en) 1996-04-23 2003-08-05 Canon Kabushiki Kaisha Ink-jet print method and apparatus
EP1835722A1 (en) * 2006-03-15 2007-09-19 Ricoh Company, Ltd. Setting method, image recording apparatus, program and recording medium
US8363279B2 (en) 2006-03-15 2013-01-29 Ricoh Company, Ltd. Method and device for setting multiple tones in halftone process to prevent mixing of adjacent ink dots

Also Published As

Publication number Publication date
JP2643942B2 (en) 1997-08-25

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Legal Events

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