WO2004030344A1 - Verfahren zur optimierten farbwiedergabe einer farbigen bildvorlage - Google Patents
Verfahren zur optimierten farbwiedergabe einer farbigen bildvorlage Download PDFInfo
- Publication number
- WO2004030344A1 WO2004030344A1 PCT/EP2003/010045 EP0310045W WO2004030344A1 WO 2004030344 A1 WO2004030344 A1 WO 2004030344A1 EP 0310045 W EP0310045 W EP 0310045W WO 2004030344 A1 WO2004030344 A1 WO 2004030344A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- color
- image
- reproduction device
- assignment
- space
- Prior art date
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Classifications
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- 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
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6058—Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut
Definitions
- An image original BV is z '.B. represented with a scanner SC in a first color system, for example in RGB.
- the RGB image values for the image template BV are converted, for example, into CIE-LAB image values.
- the image template is now to be output by a color reproduction device, for example a printer.
- the printer works in a second color system, eg CMYK. Accordingly, the CIE-LAB color values are converted into the CMYK color system.
- the WG printer can print the image template as a BV.
- the device-dependent color description is therefore often converted into a device-independent color system (eg CIELAB).
- CIELAB device-independent color system
- the color values are usually determined with a color measuring device and assigned to the device-dependent color description (RGB, CMYK). assigns.
- RGB, CMYK device-dependent color description
- assigns One way of assigning such a color is to create tables, as is done in the color profiles according to the ICC International COLOR Consortium (address: www.Color.org).
- Such color profiles are also described in DE 199 46 585 AI.
- FIG. 2 There, in an xy graphic (as part of CIExyY), the theoretically possible maximum color space FR (solid curve) and the color space FR that can be achieved by a color reproduction device, for example a printer, are shown above the color standard components x, y. WG (dash-dotted curve) shown. Colors are also given as an example. If the color space that can be achieved by an image template is larger than the color space that can be achieved by the color reproduction device, the color space is adjusted (shown by solid arrows). The colors are outside the color space of the color dergabettis moved into the color space of the color rendering device. This compression takes place for all colors lying outside the color space of the color reproduction device, but also for colors lying within the color space of the color reproduction device, in order to obtain the color gradation explained above.
- Motomura Gamut Mapping using color-categorical weihting method, IS&T Proceedings, Eighth Color Imaging Conference, 2000-11-07, Scottsdale.
- the conversion of color information ensures that there are comprehensible color descriptions throughout the entire color transfer process.
- This color value conversion uss for each individual device (or device class) and also for different transmission settings (brightness setting on the monitor, paper type for the printer, etc.). This is carried out once for each device state used according to the procedures customary today.
- the problem to be solved by the invention consists in specifying a method with which image originals can be reproduced as true to color as possible with a color reproduction device. All color images that are to be output by a color reproduction device, regardless of their origin, are referred to here as an image template.
- an image can be a photo that has been scanned or a color image generated directly by a computer.
- the image template stored in a computer may have been counted several times.
- the color assignment for the color reproduction device is now generated depending on the image template to be output.
- the reproduction properties of the color reproduction device are determined as previously via test outputs. A normal correction of the measurement data obtained in this way (averaging, changing the support points) can also be carried out. However, there is no color space adjustment yet.
- the required color space for the original image is created by analyzing the colors that occur.
- This color space information of the image template can also be generated in advance when the image template is created. Only when it has been clarified how the image template should be output, e.g. color rendering device, substrate, settings, etc., is the individual color mapping between the color values of the image template and the color rendering device created, if the color rendering device is a printer, usually in CMYK.
- This color assignment then forms the pro- fil the color rendering, which can be saved in tabular form or the color space conversion function.
- the advantage of the method according to the invention is therefore that the color space adaptation differs depending on the image template, that is to say it is only changed as much by color space adaptation as is required for the respective image template. This results in an improvement in color rendering, an increase in the brilliance of the images, a reduction in color errors compared to the original image, and an improved color adjustment for different substrates.
- FIG. 3 shows a further illustration of the color spaces of the image template and color reproduction device in the event that the image template falls completely into the color space of the color reproduction device;
- Fig. 4 is an illustration of the color spaces of image template
- FIG. 5 is a diagram which shows the course of the method.
- FIG. 3 shows an example in which the color space FR-WG of the color reproduction device completely comprises the color space FR-BV of the original BV1, i.e. the color reproduction device can generate all the colors contained in the image template BVl. In this case, color space compression is not required for the original image.
- the image template BV2 in FIG. 4 contains colors that do not fall into the color space FR-WG of the color reproduction device WG.
- the blue tones of the original BV2 cannot be reproduced.
- Color space compression is therefore only required in the blue area. No color matching is carried out for the other colors.
- step 1 the color space that can be reached by the color rendering device WG is determined (step 1). This is done in a known manner in that all possible colors (test colors) are output, e.g. be printed, and then measured. The assignment of the controlled color values to the color values of the color reproduction device is then determined
- Step 2 the measurement data can be smoothed in a known manner.
- the color range is determined in step 4, which can not be reproduced by the color reproduction device WG.
- step 9 it is examined whether the color space FR-BV of the original is larger than the color space FR-WG of the color reproduction device. If the color space of the color reproduction device completely covers the color space of the original, a standard color conversion can be loaded without color space compression (step 8). This image-independent color conversion is previously done once for the color reproduction device in the desired state (e.g. printing fabric). Otherwise the image-dependent color assignment, for example the image-dependent profile, is created for the color reproduction device in step 5. As described above, the non-reproducible color range is optimally adapted to the color space of the color reproduction device using a color adjustment method. Now the image template can be printed out according to this color assignment as image BV (step 6).
- the method according to the invention is particularly advantageous if a printer, in particular an electrographic printer, is used as the color reproduction device.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Color Image Communication Systems (AREA)
- Image Processing (AREA)
- Color, Gradation (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/527,475 US7403304B2 (en) | 2002-09-19 | 2003-09-10 | Method for optimised colour reproduction of a coloured original image |
JP2004538883A JP2006505970A (ja) | 2002-09-19 | 2003-09-10 | 色原画の色再生を最適化するための方法 |
EP03757814A EP1547366A1 (de) | 2002-09-19 | 2003-09-10 | Verfahren zur optimierten farbwiedergabe einer farbigen bildvorlage |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10243554.5 | 2002-09-19 | ||
DE10243554A DE10243554B4 (de) | 2002-09-19 | 2002-09-19 | Verfahren zur optimierten Farbwiedergabe einer farbigen Bildvorlage durch ein Farbwiedergabegerät |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004030344A1 true WO2004030344A1 (de) | 2004-04-08 |
Family
ID=31969280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/010045 WO2004030344A1 (de) | 2002-09-19 | 2003-09-10 | Verfahren zur optimierten farbwiedergabe einer farbigen bildvorlage |
Country Status (5)
Country | Link |
---|---|
US (1) | US7403304B2 (de) |
EP (1) | EP1547366A1 (de) |
JP (1) | JP2006505970A (de) |
DE (1) | DE10243554B4 (de) |
WO (1) | WO2004030344A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006050305A1 (en) | 2004-11-01 | 2006-05-11 | Technicolor Inc | Method and system for mastering and distributing enhanced color space content |
EP1964389A2 (de) | 2005-12-21 | 2008-09-03 | Thomson Licensing | Eingeschränkte farbpalette in einem farbraum |
US8478027B2 (en) * | 2006-11-06 | 2013-07-02 | Fuji Xerox Co., Ltd. | Image processing apparatus, image reproducing system and computer-readable medium |
KR101458072B1 (ko) * | 2007-04-03 | 2014-11-06 | 톰슨 라이센싱 | 상이한 색채 범위에 대한 색채 보정을 갖는 디스플레이를 위한 방법 및 시스템 |
JP5193992B2 (ja) * | 2009-12-25 | 2013-05-08 | 京セラドキュメントソリューションズ株式会社 | 画像処理装置及び画像処理プログラム |
US8810876B2 (en) * | 2011-10-31 | 2014-08-19 | Electronics For Imaging, Inc. | Dynamic image gamut compression by performing chroma compression while keeping lightness and hue angle constant |
WO2022150042A1 (en) * | 2021-01-08 | 2022-07-14 | Hewlett-Packard Development Company, L.P. | Feature extractions to optimize scanned images |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5933253A (en) * | 1995-09-29 | 1999-08-03 | Sony Corporation | Color area compression method and apparatus |
US5949427A (en) * | 1993-01-07 | 1999-09-07 | Canon Kabushiki Kaisha | Color image processing apparatus and method and color image output apparatus each using a color matching/processing method based on the color imput |
US5987165A (en) * | 1995-09-04 | 1999-11-16 | Fuji Xerox Co., Ltd. | Image processing system |
US6151136A (en) * | 1997-04-18 | 2000-11-21 | Fuji Photo Film Co., Ltd. | Color transforming method |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4731662A (en) * | 1985-03-21 | 1988-03-15 | Canon Kabushiki Kaisha | Image processing method for processing an image signal differently depending on the range of an image characteristic thereof relative to the range within which an output device can reproduce the image characteristic |
EP0606993B1 (de) * | 1993-01-11 | 2002-07-24 | Canon Kabushiki Kaisha | Abschneidung des Farbtonbereichs |
JP3600372B2 (ja) * | 1995-06-27 | 2004-12-15 | 株式会社リコー | 色再現域補正装置および方法 |
US6281984B1 (en) | 1997-03-25 | 2001-08-28 | International Business Machines Corporation | Enhanced system, method and program for converting an externally defined four dimensional colorant (CMYK) into an equivalent four dimensional colorant defined in terms of the four inks (C′M′Y′K′) that are associated with a given printer |
US6225974B1 (en) * | 1997-06-19 | 2001-05-01 | Electronics For Imaging, Inc. | Gamut correction with color separation and methods and apparatuses for performing same |
JP3960694B2 (ja) * | 1998-10-26 | 2007-08-15 | 富士通株式会社 | 色信号変換方法、色信号変換装置、記録媒体、デバイスドライバ及び色変換テーブル |
JP2001094806A (ja) * | 1999-09-21 | 2001-04-06 | Minolta Co Ltd | 画像処理装置 |
DE19946585A1 (de) | 1999-09-29 | 2001-04-12 | Heidelberger Druckmasch Ag | Verfahren zur Druckprozessanpassung mit Erhaltung des Schwarzaufbaus |
-
2002
- 2002-09-19 DE DE10243554A patent/DE10243554B4/de not_active Expired - Fee Related
-
2003
- 2003-09-10 US US10/527,475 patent/US7403304B2/en not_active Expired - Fee Related
- 2003-09-10 WO PCT/EP2003/010045 patent/WO2004030344A1/de active Application Filing
- 2003-09-10 JP JP2004538883A patent/JP2006505970A/ja active Pending
- 2003-09-10 EP EP03757814A patent/EP1547366A1/de not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5949427A (en) * | 1993-01-07 | 1999-09-07 | Canon Kabushiki Kaisha | Color image processing apparatus and method and color image output apparatus each using a color matching/processing method based on the color imput |
US5987165A (en) * | 1995-09-04 | 1999-11-16 | Fuji Xerox Co., Ltd. | Image processing system |
US5933253A (en) * | 1995-09-29 | 1999-08-03 | Sony Corporation | Color area compression method and apparatus |
US6151136A (en) * | 1997-04-18 | 2000-11-21 | Fuji Photo Film Co., Ltd. | Color transforming method |
Also Published As
Publication number | Publication date |
---|---|
EP1547366A1 (de) | 2005-06-29 |
US7403304B2 (en) | 2008-07-22 |
JP2006505970A (ja) | 2006-02-16 |
US20060096483A1 (en) | 2006-05-11 |
DE10243554B4 (de) | 2005-12-29 |
DE10243554A1 (de) | 2004-04-01 |
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