JPS6447174A - Method for converting color - Google Patents
Method for converting colorInfo
- Publication number
- JPS6447174A JPS6447174A JP62203768A JP20376887A JPS6447174A JP S6447174 A JPS6447174 A JP S6447174A JP 62203768 A JP62203768 A JP 62203768A JP 20376887 A JP20376887 A JP 20376887A JP S6447174 A JPS6447174 A JP S6447174A
- Authority
- JP
- Japan
- Prior art keywords
- color
- alpha
- color component
- picture element
- data
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Color, Gradation (AREA)
- Facsimile Image Signal Circuits (AREA)
- Color Image Communication Systems (AREA)
Abstract
PURPOSE:To attain the color conversion of satisfactory color reproductivity by separating a picture element to an achromatic color component and a color component, independently executing the conversion of these achromatic color component and color component and after that, synthesizing two color converting data. CONSTITUTION:For R, G and B video signals inputted from input terminals 1-3, a minimum value alpha is outputted per picture element by a minimum value calculator 4. A subtractor 5 executes the subtraction of R-alpha, G-alpha and B-alpha and these three subtracted values show the quantity of the color component of this picture element. A multiplier 7 executes matrix operation concerning the color component of the picture element with using a color converting coefficient matrix outputted from a coefficient generator 6 and calculates Y1, M1 and C1 signals. An ROM8 outputs color converting data Y2, M2 and C2 to correspond to the inputted alpha value. A synthesizer 9 respectively executes the addition of the two color converting data, which are the data Y1, M1 and C1 and the data Y2, M2 C2 and outputs them as Y, M and C printing signals. Thus, the color conversion of the satisfactory reproductivity can be executed.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62203768A JP2624967B2 (en) | 1987-08-17 | 1987-08-17 | Color conversion method |
GB8806182A GB2202708B (en) | 1987-03-16 | 1988-03-16 | Color converting device |
US07/168,942 US4887150A (en) | 1987-03-16 | 1988-03-16 | Device for converting video image signals to printing data signals |
DE3808818A DE3808818A1 (en) | 1987-03-16 | 1988-03-16 | DEVICE FOR CONVERTING COLORS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62203768A JP2624967B2 (en) | 1987-08-17 | 1987-08-17 | Color conversion method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6447174A true JPS6447174A (en) | 1989-02-21 |
JP2624967B2 JP2624967B2 (en) | 1997-06-25 |
Family
ID=16479494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62203768A Expired - Fee Related JP2624967B2 (en) | 1987-03-16 | 1987-08-17 | Color conversion method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2624967B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5436739A (en) * | 1991-12-03 | 1995-07-25 | Ricoh Company, Ltd. | Color correction system for transforming color image from one color space to another |
US5588050A (en) * | 1993-08-27 | 1996-12-24 | Mitsubishi Denki Kabushiki Kaisha | Method and apparatus for performing color conversion |
US5870491A (en) * | 1989-08-31 | 1999-02-09 | Canon Kabushiki Kaisha | Image processing apparatus which controls processing conditions of an image signal on detected features of the image signal |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55142342A (en) * | 1979-04-23 | 1980-11-06 | Dainippon Screen Mfg Co Ltd | Digital color tone control method |
-
1987
- 1987-08-17 JP JP62203768A patent/JP2624967B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55142342A (en) * | 1979-04-23 | 1980-11-06 | Dainippon Screen Mfg Co Ltd | Digital color tone control method |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5870491A (en) * | 1989-08-31 | 1999-02-09 | Canon Kabushiki Kaisha | Image processing apparatus which controls processing conditions of an image signal on detected features of the image signal |
US5436739A (en) * | 1991-12-03 | 1995-07-25 | Ricoh Company, Ltd. | Color correction system for transforming color image from one color space to another |
US5588050A (en) * | 1993-08-27 | 1996-12-24 | Mitsubishi Denki Kabushiki Kaisha | Method and apparatus for performing color conversion |
US5729636A (en) * | 1993-08-27 | 1998-03-17 | Mitsubishi Denki Kabushiki Kaisha | Method and apparatus for performing tone conversion |
Also Published As
Publication number | Publication date |
---|---|
JP2624967B2 (en) | 1997-06-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0173032A3 (en) | Digital color-image transformation | |
JPH01233921A (en) | A/d conversion circuit using delta-sigma modulator | |
JPH01259689A (en) | Sampling frequency converting circuit | |
ES8407281A1 (en) | Color television receiver with a digital processing system that develops digital driver signals for a picture tube | |
JPS6447174A (en) | Method for converting color | |
KR930019044A (en) | Color signal processing and contour correction circuit | |
CA1194988A (en) | Mixing circuit | |
GB1534427A (en) | Method of colour correction | |
EP0162500A1 (en) | A method of and apparatus for generating colour matte signals | |
JP2505300B2 (en) | Color image signal color correction device | |
JPS6412381A (en) | Picture information conversion method | |
JPS55142342A (en) | Digital color tone control method | |
EP0393812A3 (en) | Hue control for colour video systems | |
GB1363197A (en) | Correcting colour television signals | |
JPS60207189A (en) | Image signal processor | |
JPS5742283A (en) | Chromachy signal generator | |
KR970006302B1 (en) | Hanging dot elimination circuit | |
KR0114433Y1 (en) | Video signal converting circuit | |
JP3005408B2 (en) | Video signal processing device | |
JPS54104240A (en) | Color encoder | |
JPS5592083A (en) | Outline compensation circuit | |
JPS5750186A (en) | Color signal processing circuit | |
JPS6417042A (en) | Method for correcting color for composite image | |
US5499058A (en) | Digital color encoder using triangular wave modulation | |
JPS5718183A (en) | Synchronizing signal generator |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |