Patent US5982990A successfully refreshed from Google Patents.
US5982990A
Expired / Lapsed
US
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Method and apparatus for converting color space
Assignee: Hewlett Packard Development Co LP
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Filing: 1997-06-04
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Granted: 1999-11-09
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Expires: 2017-06-04
Abstract
Abstract An ink-jet printing system and method are disclosed which convert monitor-based RGB images to an image represented in CMYLcLmK, in which Lc is a low-dye-load cyan and Lm is a low-dye-load magenta. The method provides a color cube matrix in RGB color space, with a finite set of control points within this color cube. Each control point has a corresponding set of parameters in the CMYLcLmK color space. The control points provide transition points between use of high-dye-load inks and low-dye-load inks to enhance the color image, especially in areas where high-dye-load inks would cause graininess. Based on this set of control point an interpolation is made to arrive at CMYLcLmK parameters of any point in the cube.
Inventors
- 👤 Jay A Gondek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:15
CPC Classifications
G; G06; G06T; G06T11/00; G06T11/10; H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6019
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A color conversion method for converting from a near-analog color space to a multi-dimensional output color space, said output color space having at least one color that has at least two output options, the method comprising: providing a set of control points within said near-analog color space, each of said control points having a corresponding set of parameters in said output color space, said control points providing transitions between said options of said at least one color having said at least two output options; and interpolating selected points within said near-analog color space between said control points to determine parameters of said selected points in said output color space; wherein said output options are provided by varying colorant loadings in inkjet inks; and wherein said output color space is comprised of at least the colors CMYLcLm, where Lc is low-dye-load cyan and Lm is a low-dye-load magenta; and wherein at least a portion of said control points provide transitions between the use of high-dye-load inks and low-dye-load inks.
Claim 2
Dependent Claim
168 words
A color conversion method for converting from a near-analog color space to a multi-dimensional output color space, said output color space having at least one color that has at least two output options, the method comprising: providing a set of control points within said near-analog color space, each of said control points having a corresponding set of parameters in said output color space, said control points providing transitions between said options of said at least one color having said at least two output options; and interpolating selected points within said near-analog color space between said control points to determine parameters of said selected points in said output color space; wherein said output options are provided by varying colorant loadings in inkjet inks; and wherein said output color space is comprised of at least the colors CMYLcLm, where Lc is low-dye-load cyan and Lm is a low-dye-load magenta; and wherein at least a portion of said control points provide transitions between the use of high-dye-load inks and low-dye-load inks.
Claim 3
Dependent Claim
173 words
A printer using a color conversion method for converting from a near-analog color space to a multi-dimensional output color space, said output color space having at least one color that has at least two output options, the printer being operated to: provide a set of control points within said near-analog color space, each of said control points having a corresponding set of parameters in said output color space, said control points providing transitions between said options of said at least one color having said at least two output options; and interpolate selected points within said near-analog color space between said control points to determine parameters of said selected points in said output color space; wherein said output options are provided by varying colorant loadings in inkjet inks; and wherein said output color space is comprised of at least the colors CMYLcLm, where Lc is low-dye-load cyan and Lm is a low-dye-load magenta, and wherein at least a portion of said control points provide transitions between the use of high-dye-load ink and low-dye-load inks.
Claim 4
Dependent Claim
173 words
A printer using a color conversion method for converting from a near-analog color space to a multi-dimensional output color space, said output color space having at least one color that has at least two output options, the printer being operated to: provide a set of control points within said near-analog color space, each of said control points having a corresponding set of parameters in said output color space, said control points providing transitions between said options of said at least one color having said at least two output options; and interpolate selected points within said near-analog color space between said control points to determine parameters of said selected points in said output color space; wherein said output options are provided by varying colorant loadings in inkjet inks; and wherein said output color space is comprised of at least the colors CMYLcLm, where Lc is low-dye-load cyan and Lm is a low-dye-load magenta, and wherein at least a portion of said control points provide transitions between the use of high-dye-load ink and low-dye-load inks.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-11-08 | 2003-05-10 | 2003-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-08 | 2007-05-10 | 2007-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-08 | 2011-05-10 | 2011-11-09 | $7700.00 | Window Closed / Lapsed |