US3572943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color film evaluation system
Assignee: Individual
•
Filing: 1968-04-22
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Granted: 1971-03-30
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Expires: 1988-04-22
Abstract
Abstract This specification discloses a system for evaluating the color balance density and contrast of color film by means of projecting the color film onto a screen and visually comparing it with a standard reference image on the screen, and to apparatus for such system.
Inventors
- 👤 Ferrand D E Corley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:36
CPC Classifications
G; G03; G03B; G03B33/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
180 words
A method for visually evaluating the color balance of a color film such as a motion picture film or a slide comprising the steps of: forming a plurality of neutral gray color tone bands defining a reference image on a portion of a projection screen, said forming step comprising forming a plurality of distinct bands of different neutral gray color intensity, each such band embodying a predetermined balanced intensity of red, green and blue respectively, whereby to give a neutral gray color appearance; simultaneously projecting a film image from said color film to be evaluated onto another portion of the same said screen so as to appear adjacent to said reference image; simultaneously viewing said images and comparing the color intensities of said film image with said reference image to detect any lack of color balance therebetween; and, adding to or subtracting from one or more colours of said film image while the same is being projected to bring the same into color tone balance with at least one of said neutral gray color tone bands of said reference image.
Claim 2
Independent Claim
180 words
A method for visually evaluating the color balance of a color film such as a motion picture film or a slide comprising the steps of: forming a plurality of neutral gray color tone bands defining a reference image on a portion of a projection screen, said forming step comprising forming a plurality of distinct bands of different neutral gray color intensity, each such band embodying a predetermined balanced intensity of red, green and blue respectively, whereby to give a neutral gray color appearance; simultaneously projecting a film image from said color film to be evaluated onto another portion of the same said screen so as to appear adjacent to said reference image; simultaneously viewing said images and comparing the color intensities of said film image with said reference image to detect any lack of color balance therebetween; and, adding to or subtracting from one or more colours of said film image while the same is being projected to bring the same into color tone balance with at least one of said neutral gray color tone bands of said reference image.
Claim 3
Dependent Claim
62 words
The method as claimed in claim 1, wherein said step of forming said reference image comprises forming said reference image on a rectangular peripheral portion of said screen, the central rectangular portion being left blank, and wherein said step of simultaneously projecting said film image comprises projecting said film image onto said screen in said rectangular blank central portion on said screen.
Claim 4
Dependent Claim
31 words
The method as claimed in claim 1, including the step of initially adjusting the overall light intensity of said reference image and said film image to bRing the same into balance.
Claim 5
Dependent Claim
84 words
The method as claimed in claim 1, wherein said step of forming said reference image comprises projecting light through a reference slide transparency onto said screen to form a projected reference image, and wherein said step of projecting said film image is established by means of projecting light through a color film transparency onto said screen to form a projected film image, and including the step of balancing said projected reference image and said projected film image both as to color balance and intensity.
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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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |