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US4751569A
Expired / Lapsed
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Recording beam control for color image reproduction
Assignee: FFEI Ltd
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Filing: 1986-12-18
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Granted: 1988-06-14
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Expires: 2006-12-18
Abstract
Abstract A method of generating a recording beam control function for reproducing an original colored image in which a record medium is exposed to a recording beam of radiation under the control of the control function comprises (a) generating a proof (7) from the original image; (b) generating a first recording beam control function (4) at least partly from the original image using a different reproductive process (2,3); (c) comparing the color of one or more selected areas of the proof (7A,7B) with the color of the corresponding area or areas defined by the first control function; and, (d) modifying the first control function in response to the result of the comparison step to generate a second control function (6) adapted to minimize differences in color between the proof and the reproduced image.
Inventors
- 👤 Geoffrey D. Clinton
- 👤 Paul E. Yandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:04
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6011
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
A method of generating a recording beam control function for use in a method of reproducing an original coloured image in which a record medium is exposed to said recording beam of radiation under said control of said control function, said method comprising: (1) generating a proof from said original image using a first reproductive process; (2) generating a first recording beam control function at least partly from said original image using a second reproductive process different from said first reproductive process; (3) comparing the colour of at least one selected area of the proof with the colour of the corresponding area or areas defined by said first control function; and, (4) modifying said first control function in response to the result of said comparison step to generate a second control function adapted to minimize differences in colour between said proof and said reproduced image, wherein said original image is defined by a plurality of film separations, and said first reproductive process comprises a first photographic process for generating a positive, coloured proof from said film separations.
Claim 2
Independent Claim
177 words
A method of generating a recording beam control function for use in a method of reproducing an original coloured image in which a record medium is exposed to said recording beam of radiation under said control of said control function, said method comprising: (1) generating a proof from said original image using a first reproductive process; (2) generating a first recording beam control function at least partly from said original image using a second reproductive process different from said first reproductive process; (3) comparing the colour of at least one selected area of the proof with the colour of the corresponding area or areas defined by said first control function; and, (4) modifying said first control function in response to the result of said comparison step to generate a second control function adapted to minimize differences in colour between said proof and said reproduced image, wherein said original image is defined by a plurality of film separations, and said first reproductive process comprises a first photographic process for generating a positive, coloured proof from said film separations.
Claim 3
Dependent Claim
37 words
A method according to claim 1, wherein said second reproductive process comprises a second photographic process for generating monochrome positives from said film separations, and a digitizing process for generating a digital representation of each monochrome positive.
Claim 4
Dependent Claim
36 words
A method according to claim 2, wherein said digitizing process comprises scanning each of said monochrome positives and generating and storing for each pixel a digital representation of the corresponding colour component content of said pixel.
Claim 5
Dependent Claim
44 words
A method according to claim 3, wherein said control functions are defined by data representing the colour content of pixels defining said original coloured image and a control characteristic for converting said colour content data to a form suitable for controlling said recording beam.
Claim 6
Dependent Claim
15 words
A method according to claim 4, wherein said control characteristic is modified in step 4.
Claim 7
Dependent Claim
16 words
A method according to claim 4, wherein the control characteristic is stored in a look-up table.
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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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |