WO1985003581A1 - Procede d'impression en quatre couleurs - Google Patents

Procede d'impression en quatre couleurs

Info

Publication number
WO1985003581A1
WO1985003581A1 PCT/BR1985/000002 BR8500002W WO8503581A1 WO 1985003581 A1 WO1985003581 A1 WO 1985003581A1 BR 8500002 W BR8500002 W BR 8500002W WO 8503581 A1 WO8503581 A1 WO 8503581A1
Authority
WO
WIPO (PCT)
Prior art keywords
colour
black
primary colours
primary
printing process
Prior art date
Application number
PCT/BR1985/000002
Other languages
English (en)
Inventor
George Mazuza
Klaus Ervin Teske
Original Assignee
Gap. - Comércio E Indústria Ltda
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 Gap. - Comércio E Indústria Ltda filed Critical Gap. - Comércio E Indústria Ltda
Publication of WO1985003581A1 publication Critical patent/WO1985003581A1/fr

Links

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
    • B41M1/18—Printing one ink over another
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F3/00—Colour separation; Correction of tonal value
    • G03F3/04—Colour separation; Correction of tonal value by photographic means

Definitions

  • the present invention refers to printing proc sses in general, and more specifically to a colour print ing .process particularly suited for four colour printing of. images.
  • the conventional four colour process for printing a colour image consists of the superimposing of three subtractive primary colour ed inks (yellow, magenta and.cyan) with a fourth ink (black) utilized as a compensation to provide the out ⁇ lines of the shapes of the image with greater definition.
  • This printing process by superimposing inks suffers from a number of serious disadvantages which will now be discussed.
  • a first disadvantage of this conventional print ing process is related to the quantity of ink that has to be used. Since full quantities of inks having all the subtractive primary colours are applied one on top of the other, the amount of ink used is much larger than is really necessary.
  • a second disadvantage is a consequence of the first.
  • the separation of the primary co- lours for printing is done in such a manner that when the primary colours are combined and printed, the result should be a true reproduction of the original.
  • the impurities contained in the inks cause slurring, that is to say, they dull the colours and com ⁇ promise the fidelity of the reproduction.
  • a further disadvantage is related to the print ⁇ ing speed and the fact that each layer of ink of a given colour requires a drying time so as to avoid it from be ⁇ ing set off, that is to say, transferred to the reverse side of the next sheet of paper.
  • the greater the drying time for each layer of ink the slower the printing speed which means an increase in the time nece ⁇ ssary to print a series of images.
  • UK Patent N9 1.513.421 discloses a process for forming colour separation records for printing in which, apart from mentioning such removal, it is stated that it cannot be carried out in the lighter areas of the image to be reproduced, and it is suggested to increase the a- mount of primary inks to obtain better saturation.
  • the purpose of the present invention is to pro ⁇ vide a printing process which overcomes the problems of the prior art.
  • a first object of the invention is to provide a four colour printing process which provides substantial economy of the primary colour inks which are more expen ⁇ sive than black ink.
  • Another object of the present invention is to provide a four colour printing process in which the pro ⁇ blem of slurring is eliminated.
  • a further object of the present invention is to provide a four colour printing process which permits a greater printing speed than is normally obtained.
  • Yet another object of the present invention is to provide a four colour printing process which provides sharper reproduction apart from greater fidelity in the reproduction of the image.
  • these ob ⁇ jects are obtained by means of a four colour printing process using three subtractive primary colours and black, characterized by the total removal of one of the subtra£ tive primary colours in the colour separation phase, the proportional reduction of the remaining subtractive pri ⁇ mary colours and the c ⁇ pensation of the primary colours removed by black, whereby no printed area contains more than two primary colours together with black.
  • Figure 1 is a graph illustrating the approximate percentages of the primary colours and black in a conventional four colour printing process
  • Figure 2 is a graph similar to that of figure 1 showing the approximate percentages of the pri ⁇ mary colours and black in a UCR printing proc ⁇ ess
  • Figure 3 is a graph similar to that of figures 1 and 2, showing the approximate percentages of the primary colours and black in a printing pro_ cess according to the present invention.
  • print ⁇ ing is effected "the other way round", that is to say, a full amount of black is used throughout the complete i- mage (light and dark tones) to form the outlining and the shading of the image, whereas the three subtractive pri ⁇ mary colours appear only in skeleton, that is to say, they enter only to provide the desired colour.
  • the forma ⁇ tion of the contours of the image may be more precise and sharper, obtaining moreover greater quality and fidelity when compared with the conventional process due to the greater saturation and purity of the colours obtained by the smaller amount of ink and the smaller number of lay ⁇ ers of ink which results in more reflection of incident light.
  • the process of the present invention is comple ⁇ mented by a specific colour chart with three colour scales. each representing a different combination of the primary colours (magenta, yellow and cyan) together with black.
  • These scales prove that it is possible during printing to produce all the desired colour matrices with the red zone consisting- of black,, magenta and yellow, the green zone consisting of black, yellow and cyan, and the blue zone consisting of black, cyan and magenta.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

Pendant la phase de séparation des couleurs pour l'impression, la couleur primaire substractive d'intensité la plus faible dans chaque zone d'impression est entièrement retirée et compensée par du noir, chaque zone d'impression contenant un maximum de deux couleurs primaires, ainsi que du noir.
PCT/BR1985/000002 1984-02-01 1985-01-31 Procede d'impression en quatre couleurs WO1985003581A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRMU6400152 1984-02-01
BR6400152U BR6400152U (pt) 1984-02-01 1984-02-01 Uso de maxima remocao das cores primarias subtrativas na impressao de quadricromia por selecao de cores

Publications (1)

Publication Number Publication Date
WO1985003581A1 true WO1985003581A1 (fr) 1985-08-15

Family

ID=3964398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR1985/000002 WO1985003581A1 (fr) 1984-02-01 1985-01-31 Procede d'impression en quatre couleurs

Country Status (4)

Country Link
EP (1) EP0174315A1 (fr)
AU (1) AU3931285A (fr)
BR (1) BR6400152U (fr)
WO (1) WO1985003581A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027923A1 (fr) * 1994-04-09 1995-10-19 Lucien Frisch Procede de separation des couleurs
WO1998038044A2 (fr) * 1997-02-28 1998-09-03 Roberto Olvera Camacho Procede pour l'obtention d'une tabulation permettant de representer une palette de couleurs reproductibles avec exactitude

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB506581A (en) * 1937-08-28 1941-05-30 Philip Sidney Hillard Henry Improvements in photographic and photomechanical colour printing
US4217822A (en) * 1978-08-07 1980-08-19 Triprint Pty. Ltd. Color printing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB506581A (en) * 1937-08-28 1941-05-30 Philip Sidney Hillard Henry Improvements in photographic and photomechanical colour printing
US4217822A (en) * 1978-08-07 1980-08-19 Triprint Pty. Ltd. Color printing method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Der Polygraph, Volume 24, No. 7, 5 April 1971, Verlag GmbH Frankfurt/Main (DE), A. KLAUS: 'Uber die Problematik des Schwarzauszuges', pages 392 - 396 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995027923A1 (fr) * 1994-04-09 1995-10-19 Lucien Frisch Procede de separation des couleurs
WO1998038044A2 (fr) * 1997-02-28 1998-09-03 Roberto Olvera Camacho Procede pour l'obtention d'une tabulation permettant de representer une palette de couleurs reproductibles avec exactitude
WO1998038044A3 (fr) * 1997-02-28 1998-11-05 Camacho Roberto Olvera Procede pour l'obtention d'une tabulation permettant de representer une palette de couleurs reproductibles avec exactitude
US6217337B1 (en) * 1997-02-28 2001-04-17 Roberto Olvera-Camacho Method for obtaining a tabulation to display a range of colors which can be reproduced with accuracy

Also Published As

Publication number Publication date
AU3931285A (en) 1985-08-27
BR6400152U (pt) 1985-09-10
EP0174315A1 (fr) 1986-03-19

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