WO2007091278A1 - Procédé et système d'impression couleur - Google Patents

Procédé et système d'impression couleur Download PDF

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Publication number
WO2007091278A1
WO2007091278A1 PCT/IS2007/000005 IS2007000005W WO2007091278A1 WO 2007091278 A1 WO2007091278 A1 WO 2007091278A1 IS 2007000005 W IS2007000005 W IS 2007000005W WO 2007091278 A1 WO2007091278 A1 WO 2007091278A1
Authority
WO
WIPO (PCT)
Prior art keywords
colour
printing
halftone
colours
spot
Prior art date
Application number
PCT/IS2007/000005
Other languages
English (en)
Inventor
Ingi Karlsson
Original Assignee
Ingi Karlsson
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 Ingi Karlsson filed Critical Ingi Karlsson
Publication of WO2007091278A1 publication Critical patent/WO2007091278A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing

Definitions

  • the invention is within the field of colour printing, in particular for multi-colour printing on offset printing presses.
  • TRUMATCH 4-colour matching system which provides visual tools for colour matching on-press and on printers/copiers.
  • This patented, digital system is the 4-colour palette in many software products for graphic design and illustration, e.g. from Adobe, Corel, Deneba, InScribe, Macromedia, and Quark.
  • the system uses a logical organization of process colour by HSB (Hue/ Saturation/Brightness), showing 50 hue families in the order of the spectrum, with 40 proportioned tints and shades of each hue plus 4-colour greys. See, www.trumatch.com.
  • TRUMATCH is strictly for use in 4-colour printing and consequently uses halftones to produce the various colour shades of the system.
  • specialty mixed inks can be used to obtain deeper, more solid colour appearance.
  • Such specialty colours are provided e.g. from Pantone as the Pantone Matching System (PMS) that consists of 14 basic colours represented in a colour formula guide which represents each colour of the system and describes how to physically mix the 14 basic colours together to obtain well over a thousand different colours/colour shades defined in the colour formula guide, each colour consisting of 1 or more of the Pantone base colours in addition to transparent white for lighter colour shades.
  • PMS Pantone Matching System
  • US Patent 5,161 ,974 (1992) describes a system of a total of 20 base colours, each consisting of 2 process colours mixed by parts. In addition lighter shades of colour can be achieved in this system using halftones (i.e. so called tints).
  • the present invention provides in one aspect a method for printing a desired colour as a continuous spot colour, the method comprising a simple reiterative process making possible the printing of solid spot colours that are mixed from basic process colours used in four colour printing.
  • a dual purpose colour system consisting of a plurality of colours where each colour of the system (hereinafter referred to as "The Colour") is made up from one or more of the process colours Cyan, Magenta, Yellow and Black (CMYK) with, a) on one hand the correct halftone percentages for printing said continuous colour in traditional 4-colour printing along with, on the other hand, b) a formula for physically mixing by weight (grams and/or parts) and printing The Colour as a single spot colour, consisting solely of the same process colours (colourants) used for achieving the continuous colour, optionally adding transparent ink (lacquer) or white ink to ensure proper ink film thickness for visually matching the continuous halftone version of The Colour described in paragraph a) here above.
  • the Colour as a single spot colour, consisting solely of the same process colours (colourants) used for achieving the continuous colour, optionally adding transparent ink (lacquer) or white ink to ensure proper ink film thickness for visually matching the continuous halftone version of The Colour described in paragraph a)
  • the desired colour has been printed as a continuous spot colour and the same colour (unique name or number) can be printed readily again on the same selected surface type by using the same ink mix composition that has been determined for said colour.
  • a spectrophotometer is used for the colour comparison and matching; the sample print colour patch is measured with the spectrophotometer and a numerical value is obtained (suitably expressed in L*a*b * coordinates), the test print printed with the mixed spot colour is subsequently measured and the measurement value compared to the reference value of the sample print patch; if the values do not match the process is repeated as described above.
  • the relative amount of the process colour inks as well as the amount of transparent ink (lacquer) or white ink in the spot mixture is registered together with the density value for the spot colour print. These values are registered pair-wise with the identity of the reference colour (e.g. with reference to the halftone composition, respective density of each process colour and L*a*b* coordinates of the reference colour).
  • the selected surface type may, e.g., be selected from glossy-surface paper, matte surface paper or regular non-surface-layered paper or any other material, paper or other material, such as plastic, metals or even clothing.
  • the basic process colours used in accordance with the invention are suitably one or more of the basic process colours cyan, magenta, yellow and black (CMYK), preferably as defined by the international standard ISO 2846-1 :1997 optionally in addition to transparent ink (lacquer) or white ink, to ensure correct ink film thickness for the respective surface.
  • CYK basic process colours cyan, magenta, yellow and black
  • Other process colour sets can however as well be used for reference, such as Hexachrome colours (CMYKOG, Pantone, USA).
  • a reference colour chart is created, provided and printed, comprising a plurality of halftone colour patches of a suitable minimum size such that an individual patch can be measured with a conventional spectrophotometer.
  • the colour chart is a standardized colour chart such as e.g. the ECI 2002 chart, a superset of ISO 12642:1996 that by itself contains a very large number of colour patches where each individual patch has a known L*A*B* value.
  • an output profile such as an ICC (International Colour Consortium) profile may be created and used over and over again for each chosen type of paper or other material.
  • ICC profile International Colour Consortium
  • ICC profiling or proper adjustment of output is a premise for printing the halftone versions of any colour selected for said colour matching system.
  • ICC output profiles and documentation on usage and adjustment of output and printing machine are preferably provided with said colour matching system, allowing even the smallest print houses to produce visually correct halftone versions of any colour of said colour matching system.
  • the specimen may be suitably compared to a series of sample prints by manual or automatic (halftone density based and/or spectrophotometric) comparison to a chart such as the ECI 2002 chart; or the desired colour can be simply selected from such series of sample patches.
  • the next step of the method comprises mixing a spot colour from the basic process colours of the halftone colours used in the sample print patch, the ratio of the individual colour components may be selected based on the halftone composition of the sample print patch.
  • the thus obtained mixed spot colour is printed on said selected surface type (e.g. glossy-surface paper, matte surface paper or regular non-surface- layered paper) and the resulting print is compared to the sample print patch, preferably by numerical comparison, e.g., as described above. If the match between the printed spot colour and the sample print is imperfect, a slight amount of one or more of the process colours in the spot colour mix is added to the colour mix and a new print is made.
  • a transparent ink (lacquer) or white ink is optionally used to achieve the desired ink film thickness and lightness. This step may be repeated multiple times until a visual match is obtained.
  • the density of the colour is measured, suitably by using a pre-defined density indicator for the basic process colour(s) being used (cyan, magenta, yellow or black).
  • a pre-defined density indicator for the basic process colour(s) being used cyan, magenta, yellow or black.
  • the measured density and the process colour composition are registered and paired up and thus the same spot colour can be produced on demand on the same selected surface type.
  • the process is completed for a number of colours, each colour on a series of different surface types, such as, e.g., glossy-surface paper, matte surface paper and regular non-surface-layered paper; this will ensure that a desired colour (colour tone) can be achieved on various types of surfaces, resulting in virtually the same visual colour tone regardless of chosen paper type/surface.
  • the invention provides a colour printing kit comprising: a chart or set of prints comprising a plurality of halftone separated single colour patches; a dataset listing the halftone composition of each patch colour and listing relative amounts of basic process colours for printing the respective colours as solid spot colours as well as the needed amount of transparent ink (lacquer) or white ink for optimal ink film thickness.
  • the colour printing kit of the invention further comprises a chart or set of prints comprising a plurality of solid spot colour patches that correspond to one or more and preferably all of said halftone separated halftone colour patches.
  • the colour printing kit is in another useful embodiment provided as an electronic dataset stored on an electronic data medium, e.g. in a computer memory, on a CD or disc or other computer memory type.
  • a dataset may suitably be used in connection with a computer running a computer program that will provide parameters for printing a desired spot colour based on a colour description that is given as input to the program in the form of a halftone printing definition, L*a*b* coordinates or the like colour definition.
  • the invention additionally pertains in yet a further aspect to a method of printing a desired colour as a solid spot colour using a colour kit of the present invention, the method comprising the steps of: providing a sample print of said desired colour or a numerical definition of the desired colour in terms of halftone composition or colour parameters such as L*a * b * coordinates, matching said desired colour to the closest halftone single colour patch and/or colour definition from said dataset, mixing a colour ink mix based on the relative amounts of process colours as in the data set element associated with said closest matching colour, printing said desired colour using the obtained colour ink mix, optionally mixed with transparent ink (lacquer) or white ink to ensure optimal ink film thickness and lightness.
  • Figure 1 illustrates a colour printing kit according to the invention providing values for two colours as printed by halftone printing (1a) and spot colour printing (1b).
  • Figure 1 shows an example of two colour entries, "Spot Red” and “Spot Sky Blue” from a colour printing kit in accordance with the invention.
  • Figure 1a shows the parameters for conventional halftone printing of the two colours, showing halftone values for cyan, magenta, yellow and black (C, M, Y, K) in that order.
  • Figure 1b shows parameters for printing the visually best possible match of said halftones as spot colours by mixing the basic colour inks C, M, Y, K, (relative values listed in that order) adding transparent ink (fifth value) to obtain correct film thickness.
  • the values listed in the five boxes for each paper type are the relative amounts of the basic colours and transparent ink to be mixed in the spot colour ink mixtures. Note that the values in the Figure are not necessarily correct; these would need to be first obtained with the method of the invention as described herein.
  • the entries are depicted as pages in a handy flip book providing recipes for a number of spot colours.

Landscapes

  • Ink Jet (AREA)

Abstract

Procédé d'impression de toute couleur parmi un nombre important de couleurs en tant que couleur d'accompagnement continu à partir de couleurs de base de la quadrichromie, telles que des couleurs classiques CMYK, ainsi que procédé d'élaboration d'un manuel de référence servant de guide d'impression rapide et facile d'une couleur prédéterminée sous forme de couleur d'accompagnement intégrale. L'invention concerne également une trousse d'impression contenant un manuel ou un ensemble d'impressions composées d'échantillons de couleurs simples séparées par une pluralité de demi-teintes, un ensemble de données classifiant la composition en demi-teinte de chaque échantillon et les quantités relatives de couleurs de la quadrichromie de base servant à imprimer les couleurs respectives sous forme de couleurs d'accompagnement intégrales et contenant également, de préférence, des échantillons de couleurs d'accompagnement intégrales correspondant aux échantillons de demi-teintes.
PCT/IS2007/000005 2006-02-06 2007-02-05 Procédé et système d'impression couleur WO2007091278A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IS8286 2006-02-06
IS8286A IS2275B (is) 2006-02-06 2006-02-06 Aðferð og kerfi fyrir litaprentun

Publications (1)

Publication Number Publication Date
WO2007091278A1 true WO2007091278A1 (fr) 2007-08-16

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Country Status (2)

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IS (1) IS2275B (fr)
WO (1) WO2007091278A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2318938A1 (fr) * 2008-08-27 2011-05-11 Sun Chemical Corporation Adaptation automatique de couleurs d' encres de solides et de tons
EP2299688A3 (fr) * 2009-09-16 2013-10-23 Fuji Xerox Co., Ltd. Appareil de traitement d'images et procédé de traitement d'images
US20160155367A1 (en) * 2013-08-12 2016-06-02 Sun Chemical Corporation Digitally printed color cards
DE102017104126A1 (de) 2017-02-28 2018-08-30 ColorGATE Digital Output Solutions GmbH Verfahren zur Herstellung eines Farbfächers
US10205849B2 (en) 2014-04-28 2019-02-12 Hewlett-Packard Development Company, L.P. To process information to use at least one opaque ink as a process colorant

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1041733A (en) * 1962-03-08 1966-09-07 Piringer Fritz Method and means for determining in a visual manner colours and colour tolerances inany kind of artificial light or sunlight
US5161974A (en) * 1992-01-27 1992-11-10 Jean Bourges Color system
US5634795A (en) * 1992-04-01 1997-06-03 Davies; Kenneth W. Color cube model
US6464336B1 (en) * 2001-10-31 2002-10-15 Eastman Kodak Company Ink jet printing with color-balanced ink drops mixed using bleached ink
US20030048463A1 (en) * 2001-08-30 2003-03-13 Andreas Paul Method for adapting the colors printed by a second printing system to the colors printed by a first printing system
EP1310374A1 (fr) * 2001-11-12 2003-05-14 Eastman Kodak Company Impression à jet d'encre avec des gouttes d'encre prémélangées et équilibrées en couleurs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1041733A (en) * 1962-03-08 1966-09-07 Piringer Fritz Method and means for determining in a visual manner colours and colour tolerances inany kind of artificial light or sunlight
US5161974A (en) * 1992-01-27 1992-11-10 Jean Bourges Color system
US5634795A (en) * 1992-04-01 1997-06-03 Davies; Kenneth W. Color cube model
US20030048463A1 (en) * 2001-08-30 2003-03-13 Andreas Paul Method for adapting the colors printed by a second printing system to the colors printed by a first printing system
US6464336B1 (en) * 2001-10-31 2002-10-15 Eastman Kodak Company Ink jet printing with color-balanced ink drops mixed using bleached ink
EP1310374A1 (fr) * 2001-11-12 2003-05-14 Eastman Kodak Company Impression à jet d'encre avec des gouttes d'encre prémélangées et équilibrées en couleurs

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2318938A1 (fr) * 2008-08-27 2011-05-11 Sun Chemical Corporation Adaptation automatique de couleurs d' encres de solides et de tons
EP2318938A4 (fr) * 2008-08-27 2012-03-28 Sun Chemical Corp Adaptation automatique de couleurs d' encres de solides et de tons
EP2299688A3 (fr) * 2009-09-16 2013-10-23 Fuji Xerox Co., Ltd. Appareil de traitement d'images et procédé de traitement d'images
US20160155367A1 (en) * 2013-08-12 2016-06-02 Sun Chemical Corporation Digitally printed color cards
US10326914B2 (en) * 2013-08-12 2019-06-18 Sun Chemical Corporation Method for digitally printing color selection cards by matching the base inks to the base paints, dyes, or plastics
US10205849B2 (en) 2014-04-28 2019-02-12 Hewlett-Packard Development Company, L.P. To process information to use at least one opaque ink as a process colorant
DE102017104126A1 (de) 2017-02-28 2018-08-30 ColorGATE Digital Output Solutions GmbH Verfahren zur Herstellung eines Farbfächers

Also Published As

Publication number Publication date
IS8286A (is) 2007-08-07
IS2275B (is) 2007-09-15

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