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GB1366162A - Apparatus for photographic exposure control - Google Patents

Apparatus for photographic exposure control

Info

Publication number
GB1366162A
GB1366162A GB1134274A GB1134274A GB1366162A GB 1366162 A GB1366162 A GB 1366162A GB 1134274 A GB1134274 A GB 1134274A GB 1134274 A GB1134274 A GB 1134274A GB 1366162 A GB1366162 A GB 1366162A
Authority
GB
United Kingdom
Prior art keywords
produce
signal
signals
indicating
density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1134274A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to GB1134274A priority Critical patent/GB1366162A/en
Publication of GB1366162A publication Critical patent/GB1366162A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/80—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus in dependence upon automatic analysis of the original

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

1366162 Photographic exposure control by scanning EASTMAN KODAK CO 19 Aug 1971 11342/74 Divided out of 1366161 Headings G2A ABH A404 A483 A486 A489 A557 A558 A711 and A709 An original (12), Fig. 1, (not shown) is scanned to produce signals D representing its point-bypoint optical density; the signals D are integrated at 24 and inverted at 26 to produce a signal - A indicating the average neutral density, fed to a peak voltage detector 28 to produce a signal X indicating the max or min density, and fed to a differentiator 32 and integrator 34 to produce a signal # indicating the average rate of density charge; and the signals -A, X and # are summed at 36 to produce an exposure control signal F which is preferably combined with red, green and blue control signals produced by a primary control (1), Fig. 1, (not shown). A manual over-ride (38) may be provided for use when unusual originals are being printed.
GB1134274A 1971-08-19 1971-08-19 Apparatus for photographic exposure control Expired GB1366162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1134274A GB1366162A (en) 1971-08-19 1971-08-19 Apparatus for photographic exposure control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1134274A GB1366162A (en) 1971-08-19 1971-08-19 Apparatus for photographic exposure control

Publications (1)

Publication Number Publication Date
GB1366162A true GB1366162A (en) 1974-09-11

Family

ID=9984514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1134274A Expired GB1366162A (en) 1971-08-19 1971-08-19 Apparatus for photographic exposure control

Country Status (1)

Country Link
GB (1) GB1366162A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018526A (en) * 1974-08-16 1977-04-19 Hoechst Aktiengesellschaft Method of and apparatus for controlling the exposure time in an apparatus for the re-enlargement of microfilms
US4092067A (en) * 1975-08-14 1978-05-30 Gretag Aktiengesellschaft Printing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018526A (en) * 1974-08-16 1977-04-19 Hoechst Aktiengesellschaft Method of and apparatus for controlling the exposure time in an apparatus for the re-enlargement of microfilms
US4092067A (en) * 1975-08-14 1978-05-30 Gretag Aktiengesellschaft Printing method

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee