US5982993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for color replacement using an extended ink set
Assignee: Xerox Corp
•
Filing: 1997-11-03
•
Granted: 1999-11-09
•
Expires: 2017-11-03
Abstract
Abstract A method and apparatus for color replacement using an extended ink set in a color printing system. A color replacement apparatus receives a color signal of a device dependent color space after being generated in response to a colorant signal of a device independent color space. The color replacement apparatus receives the color signal of the device dependent color space, and generates as a function of the received signal, a second color signal including a first hue and a first saturation, and a third color signal including the first hue and a second saturation, different from the first saturation. Multiple color planes for all of the inks of the extended ink set are generated according to a preselected threshold.
Inventors
- 👤 Michael L. Slade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6022
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
170 words
A color printing system for printing an image on a media from a plurality of image signals, comprising: a printing mechanism, to deposit a plurality of colorants on the media for printing the image thereon; a color replacement apparatus, coupled to said printing mechanism, receiving a first color signal, and generating as a function of the first color signal, a second color signal including a first hue and a first saturation, and a third color signal including the first hue and a second saturation different from the first saturation, and a color correction apparatus including a color comparator, for receiving said first color signal, and for generating, as a function of a threshold signal, said second color signal and said third color signal, said color correction apparatus being coupled to said color replacement apparatus, receiving said plurality of image signals, and generating, in response thereto, and said first color signal and said plurality of image signals comprising a red digital signal, a green digital signal, and a blue digital signal.
Claim 2
Dependent Claim
170 words
A color printing system for printing an image on a media from a plurality of image signals, comprising: a printing mechanism, to deposit a plurality of colorants on the media for printing the image thereon; a color replacement apparatus, coupled to said printing mechanism, receiving a first color signal, and generating as a function of the first color signal, a second color signal including a first hue and a first saturation, and a third color signal including the first hue and a second saturation different from the first saturation, and a color correction apparatus including a color comparator, for receiving said first color signal, and for generating, as a function of a threshold signal, said second color signal and said third color signal, said color correction apparatus being coupled to said color replacement apparatus, receiving said plurality of image signals, and generating, in response thereto, and said first color signal and said plurality of image signals comprising a red digital signal, a green digital signal, and a blue digital signal.
Claim 3
Dependent Claim
36 words
The color printing system of claim 1, wherein said color comparator generates as a function of a comparison between said threshold signal and said first color signal, said second color signal and said third color signal.
Claim 4
Dependent Claim
45 words
The color printing system of claim 2, wherein said generated second color signal and said generated third color signal determine the quantity of a first one of said plurality of colorants and a second one of said plurality of colorants to deposit on the media.
Claim 5
Dependent Claim
30 words
The color printing system of claim 3, wherein said color comparator comprises a selector, to select a lookup table including signals specifying a signal level of said second color signal.
Claim 6
Dependent Claim
20 words
The color printing system of claim 4, wherein said second color signal determines the quantity of a regular cyan colorant.
Claim 7
Dependent Claim
20 words
The color printing system of claim 5, wherein said third color signal determines the quantity of a light cyan colorant.
Claim 8
Independent Claim
159 words
A method of printing an image with a printing system, including a color replacement device, as a function of a device independent color signal, comprising the steps of: providing a threshold signal as a function of a desired image characteristic; generating a first color signal, including a first hue and a first saturation, as a function of the selected threshold and the device independent color signal; receiving the first color signal into a color correction apparatus including a color comparator; generating, as a function of a threshold signal, a second color signal and a third color signal each including the first hue and a second saturation; receiving the first, second and third color signals into the color correction apparatus, wherein the first, second and third color signals comprise a red digital signal, a green digital signal, and a blue digital signal; and printing the image as a function of the generated first color signal and the second color signal.
Claim 9
Independent Claim
159 words
A method of printing an image with a printing system, including a color replacement device, as a function of a device independent color signal, comprising the steps of: providing a threshold signal as a function of a desired image characteristic; generating a first color signal, including a first hue and a first saturation, as a function of the selected threshold and the device independent color signal; receiving the first color signal into a color correction apparatus including a color comparator; generating, as a function of a threshold signal, a second color signal and a third color signal each including the first hue and a second saturation; receiving the first, second and third color signals into the color correction apparatus, wherein the first, second and third color signals comprise a red digital signal, a green digital signal, and a blue digital signal; and printing the image as a function of the generated first color signal and the second color signal.
Claim 10
Dependent Claim
26 words
The method of claim 7, wherein said first mentioned generating step comprises generating the first color signal as a function of a device dependent color signal.
Claim 11
Dependent Claim
26 words
The method of claim 8, wherein said second mentioned generating step comprise generating the second color signal as a function of the device dependent color signal.
Claim 12
Dependent Claim
21 words
The method of claim 9, further comprising transforming the device independent color signal as a function of a color correction device.
Claim 13
Dependent Claim
15 words
The method of claim 10, wherein the color correction device comprises a linear interpolation device.
Claim 14
Dependent Claim
20 words
The method of claim 11, comprising printing an image as a function of a plurality of device independent color signals.
Claim 15
Dependent Claim
35 words
The method of claim 12, wherein said providing step comprises providing a providing a first threshold signal as a function of a desired image characteristic and one of the plurality of device independent color signals.
Claim 16
Dependent Claim
34 words
The method of claim 13, wherein said providing step comprises providing a second threshold signal as a function of a desired image characteristic and another one of the plurality of device independent color signals.
Claim 17
Dependent Claim
22 words
The method of claim 14, wherein said providing step comprises providing the first threshold signal as a function of a cyan hue.
Claim 18
Dependent Claim
22 words
The method of claim 15, wherein said providing step comprises providing the second threshold signal as a function of a magenta hue.
References Cited (Backward Citations)
US4511989A
Cited
US4686538A
Cited
US5161010A
Cited
US5331438A
Cited
US5631748A
Cited
US5710824A
Cited
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 |