GB845458A - Photographic method - Google Patents

Photographic method

Info

Publication number
GB845458A
GB845458A GB35505/57A GB3550557A GB845458A GB 845458 A GB845458 A GB 845458A GB 35505/57 A GB35505/57 A GB 35505/57A GB 3550557 A GB3550557 A GB 3550557A GB 845458 A GB845458 A GB 845458A
Authority
GB
United Kingdom
Prior art keywords
intensity
projected image
intensities
uniform illumination
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
GB35505/57A
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.)
Logetronics Inc
Original Assignee
Logetronics 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 Logetronics Inc filed Critical Logetronics Inc
Publication of GB845458A publication Critical patent/GB845458A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/02—Sensitometric processes, e.g. determining sensitivity, colour sensitivity, gradation, graininess, density; Making sensitometric wedges

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

845,458. Photographic enlarging methods. LOGETRONICS Inc. Nov. 14, 1957 [March 13, 1957], No. 35505/57. Drawings to Specification. Classes 98(1) and 98(2) In a photographic printing method the intensity and contrast of the projected image are adjusted so that a standard exposure time may be given on a standard high contrast printing material by first adjusting the intensity of the projected image so that the brighest parts are of a predetermined intensity, and then superimposing on the projected image a uniform illumination whose intensity is varied so as to give a predetermined intensity in the darkest parts, and making the exposure with the combined illuminations. The intensities in the brightest and darkest parts may be measured by means of a photoelectric meter. The intensities of the projected image and uniform illumination may be adjusted by means of resistances in the lamp circuits, by diaphragms or by variable density filters. The uniform illumination may be supplied from an auxiliary lamp or from the main projection lamp. The predetermined maximum and minimum intensities are chosen as the end-prints of the exposure scale of the printing material.
GB35505/57A 1957-03-13 1957-11-14 Photographic method Expired GB845458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US360286XA 1957-03-13 1957-03-13

Publications (1)

Publication Number Publication Date
GB845458A true GB845458A (en) 1960-08-24

Family

ID=21886196

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35505/57A Expired GB845458A (en) 1957-03-13 1957-11-14 Photographic method

Country Status (3)

Country Link
CH (1) CH360286A (en)
DE (1) DE1073863B (en)
GB (1) GB845458A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102450A (en) * 1959-11-19 1963-09-03 Autokopie A G Apparatus for optically printing photographic negatives
GB2132780A (en) * 1982-11-26 1984-07-11 Loge Dunn Instr Inc Apparatus for maintaining a cathode ray tube image in relation to the light acceptance range of a photographic film

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK153426B (en) * 1977-04-12 1988-07-11 Eskofot As PROCEDURE FOR MANAGING CONTRAST BY RASTER EPRODUCTION

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE825205C (en) * 1949-11-01 1951-12-17 Edmund Wateler Process for reducing the tonal range in optical copying

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102450A (en) * 1959-11-19 1963-09-03 Autokopie A G Apparatus for optically printing photographic negatives
GB2132780A (en) * 1982-11-26 1984-07-11 Loge Dunn Instr Inc Apparatus for maintaining a cathode ray tube image in relation to the light acceptance range of a photographic film

Also Published As

Publication number Publication date
CH360286A (en) 1962-02-15
DE1073863B (en) 1960-01-21

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