WO2001030065A1 - Procede de creation de grises et systeme permettant d'ameliorer l'impression couleur - Google Patents

Procede de creation de grises et systeme permettant d'ameliorer l'impression couleur Download PDF

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Publication number
WO2001030065A1
WO2001030065A1 PCT/US2000/028583 US0028583W WO0130065A1 WO 2001030065 A1 WO2001030065 A1 WO 2001030065A1 US 0028583 W US0028583 W US 0028583W WO 0130065 A1 WO0130065 A1 WO 0130065A1
Authority
WO
WIPO (PCT)
Prior art keywords
color
available
ink
nearest
inks
Prior art date
Application number
PCT/US2000/028583
Other languages
English (en)
Inventor
Harry Bowers
Original Assignee
Cv Us, 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 Cv Us, Inc. filed Critical Cv Us, Inc.
Priority to AU80253/00A priority Critical patent/AU8025300A/en
Publication of WO2001030065A1 publication Critical patent/WO2001030065A1/fr

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Classifications

    • 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
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids
    • B41J2/2117—Ejecting white liquids
    • 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
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids

Definitions

  • the present invention relates to the color printing arts. It finds particular application to a halftoning method and system for improving color reproduction by smoothing the transition between printed colors. It will be appreciated that the present invention will find application to any type of printing system that has a limited number of inks.
  • Ci , C 2 , C 3 , C 4 be new adjusted colors. Then:
  • the above method creates undesirable half-toning artifacts for color between the pure ink colors.
  • a printing system can print with white ink, 50% gray ink and black ink. If a 50% gray area is to be printed using classical error diffusion, the result is a solid 50% gray ink. There is no error because the color requested is exactly one of the available inks. If we wanted to print 49% gray, the result would be 98% of 50% gray ink and 2% black ink dots. The 2% of black dots on a background of 50% gray are easily apparent to the naked eye and appear as an artifact. The classic method displays an abrupt visual change from 50% gray to 49% gray because the 2% black dots on the solid 50% gray ink are visually apparent.
  • the present invention provides a new and unique halftoning method that cures the above problems and others.
  • a new and unique method of printing with a printing device that includes a set of available color inks.
  • a combination of nearest color values is outputted in a halftone pattern that produces the first color.
  • the one available color ink is outputted with a combination of nearest color values in a halftone pattern that produces the first color.
  • a printing device is provide.
  • the printing device includes a set of available color inks.
  • a halftoning pattern combines the available color inks to produce a gamut of color values.
  • the halftoning pattern includes a pattern of color dots for producing each of the available color inks by combining a plurality of different color dots formed by a combination the available color ink and color values nearest to the available color ink.
  • One advantage of the present invention is that the transition between printed colors appear smoother and artifacts are less visible.
  • Figure 1 is a diagram of a printing system and process in accordance with the present invention.
  • Figure 2 illustrates how available ink colors are printed in accordance with the present invention.
  • an overall color printing process is shown in accordance with the present invention.
  • a printing device 10 there are one or more ink colors typically contained in ink cartridges or the like.
  • the available ink colors are limited in number, for example, ink color 1, ink color 2...ink color N.
  • the available inks are also referred to as pure ink colors herein.
  • Typical printers have red, blue, green and black inks, or cyan, magenta, yellow and black inks. Of course, any combination of ink colors can be present.
  • a gamut of colors are produced by combining the available color inks in a predetermined ratio to obtain each individual color in the gamut. The ratios are defined by a halftoning algorithm 15 where each pixel of color is produced by a halftone dot pattern as is known in the art.
  • the halftone algorithm selects a halftone pattern nearest to the value of color X and the appropriate ink colors are combined according to the halftone pattern to form the color X.
  • the halftone pattern represents a combination 20 of color X and/or nearest neighbor colors.
  • the number of nearest neighbor colors can be at least one and as many as desired based on desired results. If color X is the same color as one of the available ink colors 1, 2,...N, however, the available ink color is not printed alone. Rather, as shown in Figure 2, the available ink color is printed by combining it with colors of nearest neighbor values just as a non-available ink color is printed. Thus, even though the pure ink is available, it is produced by a plurality of different color dots.
  • the halftone pattern for the available ink color includes a distribution of different color dots, some slightly darker than the available color and some slightly lighter than available color.
  • the resulting dot When the resulting dot is viewed by the human eye, it will look like the pure color.
  • visual changes between adjacent colors will be reduced, thus, visual artifacts will be reduced.
  • the transition between them is smoother because both are printed with similar or equivalent dot distributions of neighboring color values.
  • the printing device includes ink colors black, white, and 50% gray.
  • the printing device receives instructions to print 50% gray.
  • the present method does not allow a solid color area to be printed with pure ink color 50% gray. Rather, to print the gray, a combination of black, white and 50% gray is used. For example, an even distribution of 1/3 black, 1/3 white and 1/3 50% gray. Of course, other distributions can be used.
  • a 49% gray color is to be printed, the result is a combination of black, white and 50% gray dots, which give the appearance of a 49% gray color.
  • solid color areas of pure ink are eliminated which reduces artifacts between the transition of pure ink color to non-pure ink color. There is no visible abrupt change from 50% gray to 49% gray because both are made up of a distribution of black, white and gray dots.
  • halftone patterns for color values that exactly match an available ink color are not solid areas of that ink color. Rather, the available ink colors are formed with a distribution of that color and of nearest color values using error diffusion principles. In this manner, every halftone pattern has a similar or equal number of different color dots.

Landscapes

  • Facsimile Image Signal Circuits (AREA)
  • Color Image Communication Systems (AREA)
  • Ink Jet (AREA)

Abstract

La présente invention concerne un procédé de création de grisés et un système qui réduits les artefacts visibles d'un système d'impression (10) disposant d'un nombre limité d'encres de couleur. Pour chaque valeur de couleur à imprimer, la couleur est formée par une répartition de points de couleur à partir des valeurs (20) de couleur avoisinantes les plus proches. Lors de l'impression d'une couleur disponible parmi les encres de couleur, cette couleur est également formée par une répartition de points de couleur à partir de valeurs avoisinantes les plus proches. De cette manière, la transition d'une zone imprimée avec une encre de couleur disponible à une zone imprimée avec une encre de couleur similaire est atténuée visuellement et présente moins d'artefacts visuels car ces deux couleurs sont imprimées selon des répartitions similaires de valeurs de couleur les plus proches.
PCT/US2000/028583 1999-10-15 2000-10-16 Procede de creation de grises et systeme permettant d'ameliorer l'impression couleur WO2001030065A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80253/00A AU8025300A (en) 1999-10-15 2000-10-16 Halftoning method and system for improved color printing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15960699P 1999-10-15 1999-10-15
US60/159,606 1999-10-15

Publications (1)

Publication Number Publication Date
WO2001030065A1 true WO2001030065A1 (fr) 2001-04-26

Family

ID=22573240

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2000/028582 WO2001029517A1 (fr) 1999-10-15 2000-10-16 Procede et systeme d'impression utilisant des encres semi-transparentes
PCT/US2000/028583 WO2001030065A1 (fr) 1999-10-15 2000-10-16 Procede de creation de grises et systeme permettant d'ameliorer l'impression couleur

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2000/028582 WO2001029517A1 (fr) 1999-10-15 2000-10-16 Procede et systeme d'impression utilisant des encres semi-transparentes

Country Status (2)

Country Link
AU (2) AU8025200A (fr)
WO (2) WO2001029517A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110837351A (zh) * 2019-11-27 2020-02-25 深圳市汉森软件有限公司 基于icc处理的纯色处理方法、装置、设备及存储介质

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9228104B2 (en) 2012-11-02 2016-01-05 Electronics For Imaging, Inc. Method and apparatus for controlling lightness in colored inkjet inks by means of a transparent white ink composition
US11241874B2 (en) * 2019-08-09 2022-02-08 Squee-Geez Inc. Screen printing method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051844A (en) * 1989-01-30 1991-09-24 Eastman Kodak Company Digital halftoning with error diffusion
US5621546A (en) * 1993-11-02 1997-04-15 Xerox Corporation Method and apparatus for vector error diffusion with output color control
US5973803A (en) * 1995-03-16 1999-10-26 Lexmark International, Inc. Combined color halftoning
US6014233A (en) * 1998-06-09 2000-01-11 Xerox Corporation Error diffusion for color images with semi-vector quantization
US6141121A (en) * 1995-03-02 2000-10-31 Apple Computer, Inc. Method and apparatus for color halftoning

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1198591A (fr) * 1982-02-13 1985-12-31 Tadao Seto Support de reproduction multichrome par voie thermique
JPS59115853A (ja) * 1982-12-23 1984-07-04 Sharp Corp インクジエツト記録装置
JPS59218862A (ja) * 1983-05-27 1984-12-10 Ricoh Co Ltd カラ−インクジエツト記録装置
JPS6151391A (ja) * 1984-08-20 1986-03-13 Toshiba Corp 熱転写記録媒体と熱転写装置
JPH0673990B2 (ja) * 1985-07-15 1994-09-21 日本ビクター株式会社 熱転写印刷方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051844A (en) * 1989-01-30 1991-09-24 Eastman Kodak Company Digital halftoning with error diffusion
US5621546A (en) * 1993-11-02 1997-04-15 Xerox Corporation Method and apparatus for vector error diffusion with output color control
US6141121A (en) * 1995-03-02 2000-10-31 Apple Computer, Inc. Method and apparatus for color halftoning
US5973803A (en) * 1995-03-16 1999-10-26 Lexmark International, Inc. Combined color halftoning
US6014233A (en) * 1998-06-09 2000-01-11 Xerox Corporation Error diffusion for color images with semi-vector quantization

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110837351A (zh) * 2019-11-27 2020-02-25 深圳市汉森软件有限公司 基于icc处理的纯色处理方法、装置、设备及存储介质
CN110837351B (zh) * 2019-11-27 2023-09-08 深圳市汉森软件有限公司 基于icc处理的纯色处理方法、装置、设备及存储介质

Also Published As

Publication number Publication date
AU8025300A (en) 2001-04-30
AU8025200A (en) 2001-04-30
WO2001029517A1 (fr) 2001-04-26

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