GB446172A - Improvements in or relating to photographic reversal processes - Google Patents

Improvements in or relating to photographic reversal processes

Info

Publication number
GB446172A
GB446172A GB2918634A GB2918634A GB446172A GB 446172 A GB446172 A GB 446172A GB 2918634 A GB2918634 A GB 2918634A GB 2918634 A GB2918634 A GB 2918634A GB 446172 A GB446172 A GB 446172A
Authority
GB
United Kingdom
Prior art keywords
image
layer
development
silver halide
positive
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
GB2918634A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2918634A priority Critical patent/GB446172A/en
Publication of GB446172A publication Critical patent/GB446172A/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
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/50—Reversal development; Contact processes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

446,172. Photographic reversal processes. HARRISON, G. B., 23, Roden Street, Ilford, Essex. Oct. 11, 1934, No. 29186. Drawings to Specification. [Class 98. (ii)] In the silver halide reversal process, wherein a latent negative (or positive) image in a silver halide emulsion layer is removed after development, and the residual silver halide is then converted into a positive (cr negative) in the same layer, control of contrast in the reversed image is obtained by subjecting the layer to a controlled exposure to uniform light to produce general fog at any time prior to the first development, i.e. prior to, during, or after the first exposure. In the case of a film,. the fogging exposure may be given by passing the film, after it has been exposed in a camera or under a negative or positive image which is to be copied, at uniform speed under a uniformly-illuminated slit. The primary image and general fog produced by development are both removed in the usual reversal bath, whereafter the layer is exposed to diffused light and developed to produce the reversed image. The underlying theory is discussed in the Specification with reference to characteristic curves. Reference has been directed by the Comptroller to Specification 432,505, [Group XXXVIII].
GB2918634A 1934-10-11 1934-10-11 Improvements in or relating to photographic reversal processes Expired GB446172A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2918634A GB446172A (en) 1934-10-11 1934-10-11 Improvements in or relating to photographic reversal processes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2918634A GB446172A (en) 1934-10-11 1934-10-11 Improvements in or relating to photographic reversal processes

Publications (1)

Publication Number Publication Date
GB446172A true GB446172A (en) 1936-04-14

Family

ID=10287522

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2918634A Expired GB446172A (en) 1934-10-11 1934-10-11 Improvements in or relating to photographic reversal processes

Country Status (1)

Country Link
GB (1) GB446172A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609294A (en) * 1952-09-02 Cinematographic matte
US2676101A (en) * 1950-12-21 1954-04-20 Rca Corp Method of reversal processing sound tracks
US2712995A (en) * 1949-07-04 1955-07-12 Agfa Ag Process for the direct production of positive photographic images
US4327172A (en) * 1980-12-16 1982-04-27 Western Electric Company, Inc. Photographic image definition improvement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609294A (en) * 1952-09-02 Cinematographic matte
US2712995A (en) * 1949-07-04 1955-07-12 Agfa Ag Process for the direct production of positive photographic images
US2676101A (en) * 1950-12-21 1954-04-20 Rca Corp Method of reversal processing sound tracks
US4327172A (en) * 1980-12-16 1982-04-27 Western Electric Company, Inc. Photographic image definition improvement

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