DE69130188D1 - Verfahren und System zur Qualitätsverbesserung von mittels elektrophotographischen Druckern erzeugten Farb- und Schwarzweissbildern - Google Patents

Verfahren und System zur Qualitätsverbesserung von mittels elektrophotographischen Druckern erzeugten Farb- und Schwarzweissbildern

Info

Publication number
DE69130188D1
DE69130188D1 DE69130188T DE69130188T DE69130188D1 DE 69130188 D1 DE69130188 D1 DE 69130188D1 DE 69130188 T DE69130188 T DE 69130188T DE 69130188 T DE69130188 T DE 69130188T DE 69130188 D1 DE69130188 D1 DE 69130188D1
Authority
DE
Germany
Prior art keywords
black
color
images generated
quality improvement
white images
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.)
Expired - Fee Related
Application number
DE69130188T
Other languages
English (en)
Other versions
DE69130188T2 (de
Inventor
C S Chan
Terry M Nelson
James G Bearss
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.)
Hewlett Packard Development Co LP
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of DE69130188D1 publication Critical patent/DE69130188D1/de
Application granted granted Critical
Publication of DE69130188T2 publication Critical patent/DE69130188T2/de
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
    • H04N1/40—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
    • 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4057—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern being a mixture of differently sized sub-patterns, e.g. spots having only a few different diameters
    • 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
    • H04N1/52—Circuits or arrangements for halftone screening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation
DE69130188T 1990-04-27 1991-04-24 Verfahren und System zur Qualitätsverbesserung von mittels elektrophotographischen Druckern erzeugten Farb- und Schwarzweissbildern Expired - Fee Related DE69130188T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/515,946 US5111302A (en) 1988-12-02 1990-04-27 Method and system for enhancing the quality of both color and black and white images produced by ink jet and electrophotographic printers

Publications (2)

Publication Number Publication Date
DE69130188D1 true DE69130188D1 (de) 1998-10-22
DE69130188T2 DE69130188T2 (de) 1999-02-25

Family

ID=24053458

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69130188T Expired - Fee Related DE69130188T2 (de) 1990-04-27 1991-04-24 Verfahren und System zur Qualitätsverbesserung von mittels elektrophotographischen Druckern erzeugten Farb- und Schwarzweissbildern

Country Status (5)

Country Link
US (1) US5111302A (de)
EP (1) EP0454448B1 (de)
JP (1) JPH05114997A (de)
CA (1) CA2038486C (de)
DE (1) DE69130188T2 (de)

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US11007791B2 (en) * 2014-11-19 2021-05-18 Electronics For Imaging, Ing. Multi-layered textured printing
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Also Published As

Publication number Publication date
CA2038486C (en) 1995-02-07
EP0454448B1 (de) 1998-09-16
EP0454448A2 (de) 1991-10-30
DE69130188T2 (de) 1999-02-25
EP0454448A3 (en) 1993-02-24
JPH05114997A (ja) 1993-05-07
US5111302A (en) 1992-05-05

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: HEWLETT-PACKARD CO. (N.D.GES.D.STAATES DELAWARE),

8327 Change in the person/name/address of the patent owner

Owner name: HEWLETT-PACKARD DEVELOPMENT CO., L.P., HOUSTON, TE

8339 Ceased/non-payment of the annual fee