US5359436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Black recalculation for arbitrary HSL corrections in CMY color space
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1992-11-12
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Granted: 1994-10-25
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Expires: 2012-11-12
Abstract
Abstract A method for defining a new value of K (black) corresponding with a change in CMY components. Original CMYK printing colors are provided. The original CMY printing colors are corrected to create new CMY printing colors. A value of a smallest one of the original CMY colors is sensed. A value of a smallest one of the new CMY colors is sensed. By use of each of these smallest values, the original K printing color value is modified to create a recalculated K printing color value. The recalculated black value corrects for distortion of original gray balance.
Inventors
- 👤 Wilhelm Dichter
- 👤 Eggert Jung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:02
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6002; H04N1/6005; H04N1/6016; H04N1/6022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A method for defining a new value of K corresponding with a change in CMY components in a CMY color space for color manipulation in digital image processing so that original gray balance distortion is minimized, comprising the steps of: providing original CMYK printing colors having an original gray balance and where K is a black value; correcting the original CMY printing colors to create new CMY printing colors; sensing a value of a smallest one of the original CMY colors; sensing a value of a smallest one of the new CMY colors; and by use of each of said smallest values, modifying a value of the original black K printing color to create a recalculated black K printing color value which minimizes distortion of original gray balance.
Claim 2
Independent Claim
128 words
A method for defining a new value of K corresponding with a change in CMY components in a CMY color space for color manipulation in digital image processing so that original gray balance distortion is minimized, comprising the steps of: providing original CMYK printing colors having an original gray balance and where K is a black value; correcting the original CMY printing colors to create new CMY printing colors; sensing a value of a smallest one of the original CMY colors; sensing a value of a smallest one of the new CMY colors; and by use of each of said smallest values, modifying a value of the original black K printing color to create a recalculated black K printing color value which minimizes distortion of original gray balance.
Claim 3
Dependent Claim
59 words
A method according to claim 1 wherein K is modified by: first defining a gradation function; applying both of the smallest values to the gradation function to obtain first and second function values, respectively; and from the original black K value subtracting the first value and adding the second value to obtain said recalculated black K printing color value.
Claim 4
Dependent Claim
23 words
A method according to claim 2 including the step of providing the recalculated black K value between zero and a predetermined maximum value.
Claim 5
Dependent Claim
21 words
A method according to claim 1 wherein said recalculated black K value comprises a correction for distortion of original gray balance.
Claim 6
Dependent Claim
29 words
A method according to claim 1 wherein the original CMY printing colors are corrected by inputting HSL changes in a CMY transformation to create said new CMY printing colors.
Claim 7
Dependent Claim
31 words
A method according to claim 5 wherein the new CMY printing color values are input to a color computer which when outputs RGB video signals for driving a color video display.
Claim 8
Independent Claim
123 words
A method for defining a new value of K and new values of CMY components corresponding with an HSL color manipulation change in CMY components in digital image processing, comprising the steps of: providing original CMYK printing colors having an original gray balance; correcting the original CMY printing colors in a CMY transformation by inputting HSL changes in a transformation to create new CMY printing colors; sensing a value of a smallest one of the original CMY colors; sensing a value of a smallest one of the new CMY colors; and by use of each of said smallest values modifying a value of the original K printing color to create a recalculated K printing color value which minimizes distortion of original gray balance.
Claim 9
Independent Claim
123 words
A method for defining a new value of K and new values of CMY components corresponding with an HSL color manipulation change in CMY components in digital image processing, comprising the steps of: providing original CMYK printing colors having an original gray balance; correcting the original CMY printing colors in a CMY transformation by inputting HSL changes in a transformation to create new CMY printing colors; sensing a value of a smallest one of the original CMY colors; sensing a value of a smallest one of the new CMY colors; and by use of each of said smallest values modifying a value of the original K printing color to create a recalculated K printing color value which minimizes distortion of original gray balance.
References Cited (Backward Citations)
US3758707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |