WO1985003581A1 - Procede d'impression en quatre couleurs - Google Patents
Procede d'impression en quatre couleursInfo
- 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
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.
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)
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)
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 |
-
1984
- 1984-02-01 BR BR6400152U patent/BR6400152U/pt unknown
-
1985
- 1985-01-31 EP EP19850900605 patent/EP0174315A1/fr not_active Withdrawn
- 1985-01-31 WO PCT/BR1985/000002 patent/WO1985003581A1/fr unknown
- 1985-01-31 AU AU39312/85A patent/AU3931285A/en not_active Abandoned
Patent Citations (2)
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)
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)
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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Legal Events
Date | Code | Title | Description |
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AK | Designated states |
Designated state(s): AU DK FI HU JP MC NO US |
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AL | Designated countries for regional patents |
Designated state(s): AT BE CH DE FR GB LU NL SE |