GB1016561A - Photographic colour printing method and apparatus - Google Patents

Photographic colour printing method and apparatus

Info

Publication number
GB1016561A
GB1016561A GB4610461A GB4610461A GB1016561A GB 1016561 A GB1016561 A GB 1016561A GB 4610461 A GB4610461 A GB 4610461A GB 4610461 A GB4610461 A GB 4610461A GB 1016561 A GB1016561 A GB 1016561A
Authority
GB
United Kingdom
Prior art keywords
colour
correction
blue
green
photo
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
GB4610461A
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.)
Gevaert Photo Producten NV
Original Assignee
Gevaert Photo Producten NV
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 Gevaert Photo Producten NV filed Critical Gevaert Photo Producten NV
Publication of GB1016561A publication Critical patent/GB1016561A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • 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
    • G03B27/73—Controlling exposure by variation of spectral composition, e.g. multicolor printers
    • G03B27/735—Controlling exposure by variation of spectral composition, e.g. multicolor printers in dependence upon automatic analysis of the original

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

1,016,561. Photo-electric control of photographic printing. GEVAERT PHOTO-PRODUCTEN N. V. Dec. 22, 1961 [Dec. 22, 1960], No. 46104/61. Heading G1A. [Also in Division G2] In a method of making photographic prints from transparent or opaque subjects at least one of the quantities of blue, green and red light incident upon the subject depends on the integrated transmittance or reflectance of the subject both for the corresponding colour and at least one other colour. Part of the light from a source 1 passing through a transparency 2 is deflected to photo-cells 5 sensitive to blue, green and red light respectively. The outputs of cells 5 is fed through logarithmic amplifiers 6 to a computer 7 which derives the quantity of light for each colour Ei according to the equation: - where Di,j,k are the integrated transmittances of the transparency to blue, green and red light, a i is a constant, b i the correction co-efficient and c i d i are cross-correction co-efficients. The outputs of computer 7 are fed through antilogarithmic amplifiers 8 to colour control means. In a particular embodiment, c i = di = (1-b i )/2, the result of which is the application of full correction to average (grey) transparencies and reduced correction to transparencies exhibiting colour subject failure. The invention is applicable to additive or subtractive printing systems using simultaneous or sequential exposures.
GB4610461A 1960-12-22 1961-12-22 Photographic colour printing method and apparatus Expired GB1016561A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL259359 1960-12-22

Publications (1)

Publication Number Publication Date
GB1016561A true GB1016561A (en) 1966-01-12

Family

ID=19752771

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4610461A Expired GB1016561A (en) 1960-12-22 1961-12-22 Photographic colour printing method and apparatus

Country Status (4)

Country Link
BE (1) BE611866A (en)
CH (1) CH401674A (en)
DE (1) DE1422724A1 (en)
GB (1) GB1016561A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168121A (en) * 1978-04-17 1979-09-18 Pako Corporation Automatic snow/beach correction for photographic printer
US4168120A (en) * 1978-04-17 1979-09-18 Pako Corporation Automatic exposure corrections for photographic printer
EP0363969A2 (en) * 1988-10-13 1990-04-18 Canon Kabushiki Kaisha Color image reading apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5760352A (en) * 1980-09-29 1982-04-12 Dainippon Screen Mfg Co Ltd Color correction apparatus for color copying camera

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168121A (en) * 1978-04-17 1979-09-18 Pako Corporation Automatic snow/beach correction for photographic printer
US4168120A (en) * 1978-04-17 1979-09-18 Pako Corporation Automatic exposure corrections for photographic printer
EP0363969A2 (en) * 1988-10-13 1990-04-18 Canon Kabushiki Kaisha Color image reading apparatus
EP0363969A3 (en) * 1988-10-13 1992-04-01 Canon Kabushiki Kaisha Color image reading apparatus

Also Published As

Publication number Publication date
BE611866A (en) 1962-04-16
DE1422724A1 (en) 1968-11-28
CH401674A (en) 1965-10-31

Similar Documents

Publication Publication Date Title
GB828862A (en) Improvements in or relating to electrical information storage systems
GB956462A (en) Improvements in or relating to photographic colour printing
US4140391A (en) Exposure time control
GB1016561A (en) Photographic colour printing method and apparatus
US3447871A (en) Photographic colour printers and processes
GB952889A (en) Photographic colour printing methods and apparatus
GB1048280A (en) Photographic camera
US3158477A (en) Composite color photography
GB1310495A (en) Production of photographic colour prints
GB1169663A (en) Integrated Photosensitive Circuit
Irwin Photoelectric observations of two southern Cepheids.
Billmeyer Jr Use of a digital readout unit in converting spectrophotometric data to color coordinates
GB941574A (en) Improvements in or relating to colour photography
GB1315385A (en) Photographic silver dye-bleach process
GB1271505A (en) Method and apparatus for determining the exposure of a recording material
GB1020783A (en) Process and apparatus for measuring photographic exposure time
Hodge Studies of the Large Magellanic Cloud. II. The Globular Cluster NGC 1846.
GB475784A (en) Improvements in and relating to colour photography
Bell The Application of Synthetic Spectra to Colour System Transformations—II T he P hotographic and P hotoelectric UBV S ystems
GB805891A (en) Process and apparatus for producing photographic colour prints
GB576838A (en) Drop-out half-tone negatives
Brueggemann Films for Machine Read-Out
US3311016A (en) Printing processes
GB958502A (en) Albada finder for photographic cameras
GB1369864A (en) Colour signal generating apparatus