GB1412272A - Method of correcting for amount of exposure in photographic printing - Google Patents

Method of correcting for amount of exposure in photographic printing

Info

Publication number
GB1412272A
GB1412272A GB4598272A GB4598272A GB1412272A GB 1412272 A GB1412272 A GB 1412272A GB 4598272 A GB4598272 A GB 4598272A GB 4598272 A GB4598272 A GB 4598272A GB 1412272 A GB1412272 A GB 1412272A
Authority
GB
United Kingdom
Prior art keywords
negative
blue
detectors
photo
exposure
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
GB4598272A
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Publication of GB1412272A publication Critical patent/GB1412272A/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
    • 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

Abstract

1412272 Photographic printers KONISHIROKU PHOTO INDUSTRY CO Ltd 5 Oct 1972 [7 Oct 1971] 45982/72 Heading G2A The amount of exposure for printing a negative 23 is determined by measuring the average transmission density of the negative and correcting it according to the measured values of the means of the maximum and minimum densities and the density of a central zone of the negative. As shown light from the negative 23 is directed by optical fibres 27 to sets of photo-detectors 28, 28', 28" for measuring blue, green and red light respectively. As shown, the blue photo-detectors 28 are connected to an adder 30 and log converter 31 for producing an average blue transmission density signal; and to max. and min. detectors 32, 34, log converters 33, 35 and an adder 36 for producing a mean blue density signal. The central photo-detectors 28 are connected to a log converter 37 for producing a central zone blue density signal. Corresponding signals are produced for the other colours and elements 38, 38 , 38", 39, 39', 39", 40, 41 and 42 process the signals to grade the negative and produce an appropriate shutter control signal. This signal may be determined and used during exposure or determined before exposure, and memorized for subsequent use. A half mirror 25 directs the negative image on to a viewer or film alternatively locatable at 26.
GB4598272A 1971-10-07 1972-10-05 Method of correcting for amount of exposure in photographic printing Expired GB1412272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7834471A JPS4843939A (en) 1971-10-07 1971-10-07

Publications (1)

Publication Number Publication Date
GB1412272A true GB1412272A (en) 1975-11-05

Family

ID=13659354

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4598272A Expired GB1412272A (en) 1971-10-07 1972-10-05 Method of correcting for amount of exposure in photographic printing

Country Status (3)

Country Link
JP (1) JPS4843939A (en)
DE (1) DE2249343A1 (en)
GB (1) GB1412272A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56119820A (en) * 1980-02-27 1981-09-19 Canon Inc Photometric system
US4452944A (en) * 1982-02-11 1984-06-05 Lord Corporation Structural adhesive formulations

Also Published As

Publication number Publication date
JPS4843939A (en) 1973-06-25
DE2249343A1 (en) 1973-04-26

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees